Solid State Guitar Amp Forum | DIY Guitar Amplifiers

Solid State Amplifiers => Schematics and Layouts => Topic started by: pinkjimiphoton on March 03, 2022, 05:57:19 PM

Title: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: pinkjimiphoton on March 03, 2022, 05:57:19 PM
i picked up the pcb for a marshall 5010 a couple years ago on ebay.
its the two horizontal input, one headphone/line out, full tone stack with presence 30 watters.
the bottom of the pcb is marked jm78-2
it works, i hooked it up to test it and am gonna get a proper hammond transformer for it and roll my own little beast out of it hopefully, but its a little different from any schematics i've managed to find. seems like there's 3-4 different versions of the amp, but i can't seem to find any really helpful info with google, which seems to have covid brain these days .
if someone could help me out, i'd be grateful! thanks!
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: Jazz P Bass on March 04, 2022, 01:12:43 AM
Did you search the web?
I found this.
Not sure of the particulars.
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: Loudthud on March 04, 2022, 02:23:03 AM
Quote from: Jazz P Bass on March 04, 2022, 01:12:43 AM
Did you search the web?
I found this.
Not sure of the particulars.
In the upper right Notes section it says PCB: JMP27A
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: pinkjimiphoton on March 04, 2022, 12:55:19 PM
oh yeah, i searched the web, and my own 35 gig archive of schematics.
this appears to be the "early" version that nobody has traced. which is kinda weird, as i recall seeing a proper schematic for this one years ago. i have three slightly different models of this amp, and none of them are the same.
i can try and contact marshall, i guess, and see if they can help. they've been great in the past.

its similar to that schematic, but the part numbering differs a little, and it has a subtly different number of parts.

most of the schematics have a pcb # on them, but the closest i've found is actually for a tube circuit as far as board numbers.

i have glaucoma, so tracing it myself may be a bit beyond what i think i can do. i may have to ask a friend to take a look at some pics to see if we can make up a working schematic.

thanks guys. if i pull it off, it will get posted for sure.
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: Spm5010MLC on March 05, 2022, 03:56:07 AM
Hi, I also have been looking for a schematic for Marshall 30W Master Lead Combo.... the one with no headphone or output jack. Has gain/preamp, master, treble,mid, bass, and presence. 12" speaker. It's hard to find even a photo of the model I have. I purchased in 1985.
I recently opened it up to address a scratchy volume pot and decided to take some photos while I had it open... I came across something I have not seen before. Hoping someone can enlighten me as to why it would be this way.
What I thought was a capacitor in the middle tone pot area of the pcb only has one lead attached thru the hole in the board. It seems that it was just clipped after being attached. I have attached a foto. Does this seem right?
Any ideas why?
I'm going to trace the complete board in the near future and will post for anyone who's interested.

Seems I do not have access to the attachments function so I can't post the images... hmmm.

Thanks!
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: Tassieviking on March 05, 2022, 09:08:47 AM
The only one I know of is in this thread, a partial trace from photos on page 5

https://www.ssguitar.com/index.php?topic=4388.60
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: pinkjimiphoton on March 05, 2022, 11:48:24 AM
i saw that, thanks.... different from mine! ;)
mine has two inputs, horizontal, with a 1m resistor to ground and two 68k resistors like a fender. all but the smallest caps are red box caps, and the layout doesn't quite match. very similar, but not quite. i'll try and get some pics to post later.
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: pinkjimiphoton on March 05, 2022, 06:10:29 PM
ok, here's some pics of the board i have. i'm trying to draw up a schematic, gotta take a bunch of notes and stuff and connect the dots, but so far it looks really close to the other schematic other than some part values and how they're named.
the input are two 68k in parallel with a 1m to ground. i've gotta draw the rest. later, i'll try to upload a BOM with the values as shown on the boards for all the parts.
lotta stuff to do. and i suck at this.
but pics:
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: pinkjimiphoton on March 05, 2022, 06:12:56 PM
more pics   xP xP xP :o
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: pinkjimiphoton on March 06, 2022, 03:17:40 PM
Quote from: Spm5010MLC on March 05, 2022, 03:56:07 AM

I'm going to trace the complete board in the near future and will post for anyone who's interested.

Seems I do not have access to the attachments function so I can't post the images... hmmm.

Thanks!

hey bro, if ya click attachments and other options, it should give ya the option to upload pics... if not, shoot me a pm and i'll upload them for you.
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: pinkjimiphoton on March 06, 2022, 03:18:41 PM
here's the BOM from the board i have,
hope it helps someone. still working on trying to draw up the schematic, wonky eyes suck!

5010 early version BOM
board jm78-2

vr1 gain b22k
vr2 volume al00k
vr3 treble b220k
vr4 mids b22k
vr5 bass a1m
vr6 pres b22k

ic 1 mc1458e

q1 bc184
q2 bc182
q3 bc182
q4 bc212
q5 bc184

q6 mj3001 darlington
q7 mj2501 darlington

zd1 9.1v <4739>
u
db1 br62

r= red box cap
t= tantalum
e= electro
c= ceramic

c1 47n@250 r
c2 2.2u@35 t
c3 2.2u@35 t
c4 2.2n c
c5 100n c
c6 2.2u@35 t
c7 2.2n c
c8 220n@100 r
c9 4.7n c
c10 220p c
c11 47n@250 r
c12 47n@250 r
c13 22n@400 r
c14 2.2u@35 t
c15 100u@25 e
c16 100u@25 e
c17 220n@100 r
c18 22u@25 e, axial
c19 2.2n c
c20 220p c
c21 100u@25 e, axial
c22 non existant
c23 2200u@25 e, radial
c24 2200u@25 e, radial

all resistors 5% cc  1/4 watt unless specified

r1 1m
r2 68k
r3 68k
r4 10k
r5 100r
r6 22k
r7 10k
r8 470r
r9 non existant
r10 22k
r11 68k
r12 10k
r13 33k
r14 4.7k
r15 2.7k
r16 2.7k
r17 10r
r18 6r 1 watt
r19 270r 3 watt
r20 470r
r21 10k
r22 3.9k
r23 4.7k
r24 680r
r25 10r
r26 2.2k
r27 1.5k
r28 1.5k
r29 1.5k
r30 10r
r31 39r
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: Tassieviking on March 18, 2022, 11:42:41 AM
I might give you a hand with this one, its late down here now so it will have to be another day.
well,  later today maybe as it's 2.30am here now.
I did find another photo of the track side of a 78-2 PCB so I mirrored it and marked out the components quickly.
On the picture the inputs are on the left.
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: pinkjimiphoton on March 18, 2022, 12:42:58 PM
Quote from: Tassieviking on March 18, 2022, 11:42:41 AM
I might give you a hand with this one, its late down here now so it will have to be another day.
well,  later today maybe as it's 2.30am here now.
I did find another photo of the track side of a 78-2 PCB so I mirrored it and marked out the components quickly.
On the picture the inputs are on the left.

you are god like!
i've been stalled. i'm really not very good at tracing stuff out at all.
i got it working again,  bought an aluminum hammond chassis to mount it in since it's just the pcb.
just need a chance to reassemble it all.

but for all intents, other than part numbers, mostly its the same as the other schematic other than a few part values.

thank you so much tassieviking! epic and helpful!!
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: Tassieviking on March 19, 2022, 05:32:09 AM
I found a couple of mistakes on the picture of the trackside I had marked components on.
I fixed the picture and put the good one up.
I cant see the part numbers for the main capacitors, the 2200uF ones.
I had to rename R22, I had it as R32.
I have a draft of the circuit made up in KiCad, still a bit messy but I think it is correct.
Please let me know if you see any mistakes.

Could you tell me what the measurements are between the Jacks, and between pots.
I could make up a PCB in KiCad if I know the component spacing on the front panel.
The Gain pot on the schematic should be Preamp Volume, I will fix it later.
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: pinkjimiphoton on March 19, 2022, 01:43:39 PM
holy cow, tass!
that was quick!

looking at without the pcb in hand, it looks to be correct, but i will check it when i hit my workshop in a little bit.
i can definitely give you measurements.

i have another one of this particular amp, complete, do you want measurements for the chassis as well? thinking that may help not only with the spacing for the parts to layout, but also maybe you can make a proper front panel drill guide for the project as well?

i need to do this anyways, as i'm gonna mount this spare board in a hammond chassis i just picked up.

thank you for this! in your debt, along with all the rest of us messing with this in the past and future ;)
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: pinkjimiphoton on March 19, 2022, 08:35:17 PM
hey now,
i posted this on another thread on the diystompboxes forum, my bro rob strand looked it over, and had the following to say:

Cool.  Thanks jimi and tassieviking.

I have *not* checked the trace/schem, however, the input stage didn't look 100% correct.

The no input cap is correct but the arrangement at the output of the first stage of IC1 looked wrong.
I posted the correction below.   The fix actually follows the other 5010 schem fairly closely, the only
difference is the other 5010 schem has an extra 100R on the output of IC1.


Bug on schematic Rev 1, 2022-03-19

(IC1 pin 7 goes to C4 (100p) and R6 (22k) as shown)

But then from IC7 pin 7 it should go,

IC7 pin 7 to C2+
C2- to paralleled C1 (47n) & R4 (10k)
other side of paralleled C1 (47n) & R4 (10k)
   to VR1.1 (ccw)
   and to IC1 pin 3

https://www.diystompboxes.com/smfforum/index.php?topic=35555.msg1243399#msg1243399

i have not had a chance yet to confirm anything myself. hopefully maybe tonite or tomorrow if i can get some time.

again, thanks! this nut's almost cracked.

i will get measurements too asap, promise.
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: Tassieviking on March 20, 2022, 08:25:45 AM
I can not see anything wrong around C1, C2, R4, but the photo is not very clear to me.
Perhaps we could get another photo around that area that is a bit closer / clearer ?

I don't understand why Rob thinks it is wrong when he has not traced the tracks himself.
Comparing this circuit to another version of the amp is not possible when they are different.

I did find he inputs wired wrong, also R18 was connected wrong, the MIDDLE pot was reversed.
I have updated the faults and have now got Draft 2 ready.
I did enlarge and sharpen the image around C1, C2 R4 but I just cant make it out perfectly.
I really need a better photo of the tracks around C1, C2, R4, to make sure I got it right
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: Tassieviking on March 20, 2022, 09:14:58 AM
pinkjimiphoton, If I was to make up a PCB in KiCad, what changes would you like to see ?
Is there a better or modern Darlington that you would prefer ? TIP142 / TIP147 ??
I prefer a TO220, TO247 or similar at the end of the board, I could put a heatsink there or run wires to TO-3's
I always use stereo sockets for all jack sockets on PCB's, I like all the soldering points for mechanical strength.
I use Alpha 16mm pots on my projects, but it would put the alignment out with the Jack sockets (Height).
I might make up a footprint for 16mm and 24mm Alpha pots together, use what you like.
I like to use Moles KK254 and KK396 sockets for wiring off the PCB, but I usually solder the wires in anyway (No Sockets)

Here is an example of a board I'm working on, 12W / 12W reverb / 12W Mk1 / 12watt to 30watt amp (5010 poweramp)
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: pinkjimiphoton on March 20, 2022, 01:06:49 PM
that's nice work, bro!
i dunno what rob is seeing, so let me take a peek when i go downstairs.
i don't usually mess with amps much, more of a fuzzbox guy.... had to get a small production run finished yesterday,
will try and get to measurements etc this afternoon.
just woke up, crack of 1 pm. musicians.  :dbtu:

the darlingtons you're using are hip, and probably a lot easier to find than the originals!

i will try and answer all specifics this afternoon. thank YOU for your hard work on this!

the reverb 12 is one of my favs. i just finished restoring one recently, but modded slightly... using a 10" 8r celestion gives a bit more balls to it, and i had hacked in an fx loop and a touch more volume to it by adding in a simple guitarpcb.com board called a paramix.

https://www.youtube.com/watch?v=PM4GKTYwGwg

https://www.youtube.com/watch?v=_u83mHMtrco

more soon. beware of random f-bombs etc in my videos if easily offended. they're rarely SFW, and usually not particularly good ;)


Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: pinkjimiphoton on March 21, 2022, 12:47:41 AM
hey Tassieviking,

here's the deal. your schematic, the last one, has only one mistake.

r4 10k and c1 47n are in parallel. one node connects to negative side c2/gain pin 1, the other to pin 3 of the 1458.

other than that, matches the circuitboard i have on my bench as far as i can tell completely, and am absolutely sure the preamp is right other than that one spot.

its hard to see. there's a couple traces that may not look connected cuz of the way the board was laid out, and cuzza that sticker that i hadn't removed from an inspector.

here's a pic, i drew lines to show the connections, and filled in the blanks with the part #'s and values


(https://i.postimg.cc/mPpbH6PT/Resized-20220320-232132.jpg) (https://postimg.cc/mPpbH6PT)



(https://i.postimg.cc/DWW7ddGL/Resized-20220320-232256.jpg) (https://postimg.cc/DWW7ddGL)



(https://i.postimg.cc/GBZdM8PN/Resized-20220320-232301.jpg) (https://postimg.cc/GBZdM8PN)



(https://i.postimg.cc/8JMDxptC/Resized-20220320-232304.jpg) (https://postimg.cc/8JMDxptC)



(https://i.postimg.cc/Cn0Yg3Qs/Resized-20220320-232309.jpg) (https://postimg.cc/Cn0Yg3Qs)

now... for measurements. board is 12.75" long by 4" wide. it sits on a 1 inch spacer centered at the back edge of the pcb.

from edge of board, j 1 center, between the mounting pins, is 11/16ths
j1 center is exactly 2".

pots are located at 3", 4.5", 6", 7.5", 9", 10.5" all 24mm

j3 is 11 14/16" from left edge of board.

28v center tapped transformer, 1 amp, like the hammond 166j28. it will fit the mounting holes in the original units.
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: Tassieviking on March 21, 2022, 04:52:08 AM
I stand corrected on the trace at C1 and R4, I could not make that out on the pictures I was looking at.
I don't have much experience with audio circuits as I always worked in heave industry as an electrician.
I could repair 50kW DC drives for DC motors no problem, but never worked with audio circuits.

Anyway, here is Marshall 5010 PCB78-2 Draft 3 Schematic, please ignore the stereo input jacks.
I put stereo input jacks so I could start on the PCB in KiCad, I like the added strength of 50% more solder points.

Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: pinkjimiphoton on March 21, 2022, 11:13:19 AM
this is awesome!

so stoked.... thanks so much, bro!
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: Tassieviking on March 21, 2022, 12:25:22 PM
I messed around with the PCB just for fun with your measurements.
This is what i came up with so far, but will change for what we want.
This is just mucking around a bit.
Are you after a very close copy of the original, or a better suited one for making a new layout ?
I could make the board 215mm (8-1/2") wide instead of 324mm (12-3/4") wide, just wide enough for the pots to fit.
Jacks would be connected with wires, It would make the PCB cheaper to buy, and still work as a replacement.
On the mock-up I added fuses for the transformer secondary wires, I prefer that.
I made a quick footprint for the pots so you can use Alpha 16mm or 24mm ones, just 2 extra holes is all.
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: pinkjimiphoton on March 21, 2022, 01:32:06 PM
that's beautiful!
personally, i don't like pots or jacks mounted via flying leads, and do like the full size board,
if just aesthetically.

but i'm stoked either way for your kindness and awesome work. thanks man!!!
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: joecool85 on March 21, 2022, 02:25:20 PM
Quote from: pinkjimiphoton on March 21, 2022, 01:32:06 PM
that's beautiful!
personally, i don't like pots or jacks mounted via flying leads, and do like the full size board,
if just aesthetically.

but i'm stoked either way for your kindness and awesome work. thanks man!!!

I'm fine with (and often prefer) on-board pots, but jacks should never be attached via PCB.  WAY too high failure rate.
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: pinkjimiphoton on March 21, 2022, 03:01:19 PM
hey tassieviking, i think i found one other mistake...  i guess i was unclear in my description, and i just noticed it.

pin 1 of the gain pot connects to node of 10k and 47n on the 2.2uf tantalum side. so it's still off by that one connection. the 10k r4 and 47n c1 are in parallel. ONLY one side of them connects to pin 3 of the jelly bean.
the gain pot pin 1 connects to the other node, where the "input" of the rc network connects to the 2.2uf tant.

i did a q&d paint fix on it, this is how it needs to be:
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: pinkjimiphoton on March 21, 2022, 03:04:00 PM
Quote from: joecool85 on March 21, 2022, 02:25:20 PM
Quote from: pinkjimiphoton on March 21, 2022, 01:32:06 PM
that's beautiful!
personally, i don't like pots or jacks mounted via flying leads, and do like the full size board,
if just aesthetically.

but i'm stoked either way for your kindness and awesome work. thanks man!!!

I'm fine with (and often prefer) on-board pots, but jacks should never be attached via PCB.  WAY too high failure rate.

yikes. ;)
to each their own.

i'm a stompbox guy, to me, i don't like ANYTHING on flying leads with a high gain circuit personally.
and in repair, i've done more repairs on stuff with leads than mounted to the board.

if it were tubes, where they're being subjected to mechanical stress and heat, i'd agree with ya, but imho board mounted is just as easy to fix and tends to mess up a lot less.

but whatever works for ya is good by me ;)

Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: Tassieviking on March 21, 2022, 07:08:17 PM
Draft 4 and maybe final if ok with everyone.
I do have a few questions for pinkjimiphoton:
Are you happy with the numbering on the 2200uF Electrolytics ?
You had them as C23, C24, but to me it looked like C22, C23. (Not very clear though)
I marked the transformer as 14v = 14v secondary, close enough ?
I used the same Transformer number as the other 5010 schematic
Do you know what the Jack sockets are ? Cliff, Neutrik (I want the right footprint for the PCB)
Can't think of anything else right now.
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: pinkjimiphoton on March 21, 2022, 07:34:04 PM
yeah, you need a 14v-0-14v ac power supply, or 28vac center tapped. so yep, close enough.

i'm putting 6600uf caps in mine, they seem to run better with them. 2200 is ok, but quite a bit of ripple if ya run these hard. i tend to dime stuff, ....well.... i generally run the tone stack around 6, and the volume and gain dimed, anyways ;)

however i marked them big caps is how they are on the board, but there's parts that just are omitted here and there.. not even mentioned on the board. ;)

rob says i got that gain connection wrong, so i gotta check again WITH my beeper... but i think he's confusing the way the connection goes, cuz what you have now seems to match the drawing i had started and the board.

just to be sure, tho, i'm gonna beep it after dinner.
the jacks are like, identical to these:

https://www.taydaelectronics.com/hardware/6-35mm-1-4-plugs-jacks/6-35mm-1-4-stereo-insulated-unswitched-socket-jack.html
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: pinkjimiphoton on March 21, 2022, 08:35:28 PM
i think i'm wrong, and rob is right, rev 3 is the proper one.
i haven't beeped it yet, but here's the connections, and tho i got r4 and c1 being in parallel right, it appears i dropped the ball, so my bad!

Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: pinkjimiphoton on March 21, 2022, 10:44:27 PM
too much crap on my bench. yes, i AM brIAn dead. :duh :duh :duh

somehow i was confusing myself. pin 1 of gain r4 and c1 in parallel at pin 3 of ic, other side to c2 to pin 7.

rev 3 is the one. sorry for the confusion. :o

2 marshalls, a tube works head, my ps systems power tool and a bx13 24 pin to 13 pin midi guitar adapter kinda all going at once....
plus my day gig builds...

yikes!  8|
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: joecool85 on March 22, 2022, 08:16:35 AM
Quote from: pinkjimiphoton on March 21, 2022, 03:04:00 PM
Quote from: joecool85 on March 21, 2022, 02:25:20 PM
I'm fine with (and often prefer) on-board pots, but jacks should never be attached via PCB.  WAY too high failure rate.

yikes. ;)
to each their own.

i'm a stompbox guy, to me, i don't like ANYTHING on flying leads with a high gain circuit personally.
and in repair, i've done more repairs on stuff with leads than mounted to the board.

if it were tubes, where they're being subjected to mechanical stress and heat, i'd agree with ya, but imho board mounted is just as easy to fix and tends to mess up a lot less.

but whatever works for ya is good by me ;)

Honestly, this is mostly for amplifiers in my experience, but on-board jacks almost always have failed solder joints eventually because the nut will loosen and then every time someone plugs in, it pushes hard on the jack solder joints.
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: Tassieviking on March 22, 2022, 11:17:16 AM
I am a bit wary as well on any stress put on solder points, like pushing plugs in /out.
If I use a jack on a PCB it will always be a stereo switching jack socket with 6 pins for the most strength.
I made up draft 5 of the schematic, we will se how we go this time.
pinkjimiphoton, I am not sure what you meant with the measurements on the Jack Sockets.
I think you left a message on the DIYstompboxes forum that the measurements were to a pin and not the center of the socket.
I am posting a picture with measurements, If you could write on the picture and return it I can get that fixed up as well.
I have the PCB nearly finished apart from moving the Jack Sockets to the final place.
The strange footprint for the Tantalum caps is one I made up when I did the Sunn Beta board for myself.
Its so I could use Electrolytics, Tantalum, WIMA Box caps where the 2uF electrolytics were on the original PCB.

One more thing, the hole for the spacer between the heatsinks, do we want that in the same location as the original ?
I would need the measurements for that as well.
The only tracks on the top of the PCB are on the TO-3 transistor, the original did not have any, they relied on the power going through the screws.
There are also tracks on the fuse holders on the top, but they can be on the bottom, it's just the way I made the footprints.
You can make it a one sided board if someone wants to etch one, just leave out the tracks between the screws on the TO-3's like Marshall did.
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: pinkjimiphoton on March 22, 2022, 11:52:15 AM
Quote from: Tassieviking on March 22, 2022, 11:17:16 AM
I am a bit wary as well on any stress put on solder points, like pushing plugs in /out.
If I use a jack on a PCB it will always be a stereo switching jack socket with 6 pins for the most strength.

i do the same generally, tho often marshall uses the 4 pin mono ones. it doesn't matter really when ya get some guy plugging in and twisting around the plug, it's gonna break...lol

Quote
I made up draft 5 of the schematic, we will se how we go this time.
pinkjimiphoton, I am not sure what you meant with the measurements on the Jack Sockets.
I think you left a message on the DIYstompboxes forum that the measurements were to a pin and not the center of the socket.
I am posting a picture with measurements, If you could write on the picture and return it I can get that fixed up as well.

yes, i just measured to pin one on each pot, i thought it may be easier with the 22mm pots that are stock. i've never done this kinda stuff like this, so sorry for being hard to understand. will get you measurements when i get back to my bench, today's the day i recap and begin mounting it in its new chassis.
all the pots are the same distance from each other, and each pin 1 is 1.5 inches apart with the pots.

Quote
I have the PCB nearly finished apart from moving the Jack Sockets to the final place.
The strange footprint for the Tantalum caps is one I made up when I did the Sunn Beta board for myself.
Its so I could use Electrolytics, Tantalum, WIMA Box caps where the 2uF electrolytics were on the original PCB.

i like that idea, makes sense. i generally work with what i have in my parts drawers, and rarely ever use tantalums for anything. i prefer mcc's in most cases, and use 'em up to 10uf where i can.

Quote

One more thing, the hole for the spacer between the heatsinks, do we want that in the same location as the original ?

seems to be the half way point on the board,  which works out ok. maybe better to put one on each corner for stability, but i don't know it that's really necessary.

Quote
I would need the measurements for that as well.
The only tracks on the top of the PCB are on the TO-3 transistor, the original did not have any, they relied on the power going through the screws.
There are also tracks on the fuse holders on the top, but they can be on the bottom, it's just the way I made the footprints.

i think the TO-3 transistors are easier to use and come by, but their heat sinking may be a little more difficult.... they should definitely be easier to find than the stock ones.
at first i thought them screws were supposed to be soldered to the pads on the board bottom.... umm... don't do that. ;)

the fuse holders being on top are good imho, tho i still prefer the old school panel mount ones for convenience sake.  i've found the diode bridge seems to work like a fuse in this circuit ;) not reccomended, fuses are more convenient, for sure.


Quote
You can make it a one sided board if someone wants to etch one, just leave out the tracks between the screws on the TO-3's like Marshall did.

i'd have to get one etched somewhere one way or the other, and it may be above my present paygrade. i had just seen people asking for a schematic for this beast, which was why i was asking if there was one... thanks to you, Tassieviking, there is one now.
i'm just glad i could help a little in a small way.

i will get measurements when i get a chance. stay tuned!
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: Tassieviking on March 23, 2022, 03:49:56 AM
If you have a copy of where you drilled the holes on the chassis I would love to see it, that would confirm the PCB measurements.
If you can measure the PCB from the left side (Input side) to the center of the sockets and center of the pots (pin 2 wiper),
that would make it easier for me to understand.
Sometimes I don't think too clearly, I'm only 61 but have constant chronic pain and have trouble sleeping.
Shitty bone disease as well as arthritis everywhere, at least my doctor gives me drugs I only dreamed of when I was younger. ;)

I get my PCB's from JLCPCB, I just checked and 5 PCB's for this amp would cost me $18 plus shipping ($ 13 to $27 to Australia)
5 PCB's to the US would be $18US for the 5 PCB's and shipping $24US  DHL, $23US FedEx, $11 Airmail.
I think that is fairly good for 5 large PCB's (JLCPCB only do 5 PCB's minimum)
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: pinkjimiphoton on March 23, 2022, 12:44:25 PM
hahahah.... i took a few hours yesterday.

measured the living f!!* out of everything. center punched all the holes in the chassis.
drilled 'em all. somehow f'd up the line out/headphone jack hole.

so i'm the wrong guy to supply that info unfortunately. my ruler does centimeters with millimeter divisions. some of the measurements are way off trying to go to the centers of the pots, and seems to land in between some of the mm' markings.

but i DID write it down. beginning to think it may be easier to just measure from pin 1 to pin 2 of each of the pots and have you add that measurement to the ones i already posted.
regardless, the notes are on my bench; i worked til 3 am on the dang thing last nite and forgot to bring them up.

i mounted everything in the new chassis despite the one hole being off, mounted the transformer, switch, output jacks etc. wired it all up properly, brought it up on my variac,
and of COURSE, NOW its not working, tho it was on my bench... turns out the primary fuse had blown. so i replaced it, brought it back up again, this time i got a loud hum. appears one of the 2200u caps solder joint failed. so i gotta take the whole mess apart again and reflow that with some fresh solder.

i DID go up to 470u for the preamp filter caps to try and lower the noise a bit, the preamp seems fine, the hum is in the power supply cuz none of the knobs have any effect.

joy!! ;)

but it will be fine once i figure out my mistake and fix it. i'll get pics. for the most part, looks pretty good. i'm gonna fudge and make a plexi front panel for it to hide my shame on the one hole ;) .... eventually. ;)

sorry to hear about your health probs, i share them and some others, its definitely no fun bro. broke my back the last time <of 3 so far, knock on my dumb head> in 89, so if i cough or sneeze my spine tends to dislocate right between my shoulderblades, which makes life extremely problematic at times. i keep trying to live, but its kinda like standing in ice water up to my nippiles. partial paralysis is weird. i can walk and stand, but i can't really FEEL anything anymore. creepy. i quit taking the drugs they used to offer about 5 years ago. i found that the pain always seemed to get most unbearable near dosage times, and did a little research and discovered the damn hydrocodone they gave me actually could CAUSE joint pain, and i have enough, already, thanks.
replaced it with weed and aspirin. learned to deal with it. most days, i can.

btw... the mounting screw at the back of the board is exactly at 7 inches, and is the star ground for the power amp, so i guess its important ;)

also, i offset my board slightly, cuz i used a 17x8x3" chassis... so the measurements for my front panel are moved to the right a little. i gotta "nibbler" tool and used it the first time yesterday... so i ended up using a real lit up marshall power switch, and a proper socket for the mains wire. kinda neat to be able to make metal chip away like that ;)

stoked to try and help ya make this project a reality... i'd love to order a couple boards and build one from scratch.

this one will be being modified some, i think. definitely gonna put an fx loop in it, maybe add reverb too if i can figure out a way to build the send/return amps on vero... or i may just go with a belton brick, too, which would be literally stupid easy. gotta have reverb, and the circuit used in the reverb version of this circuit ain't it. just not well done.

anyways... more later, bro. thank you for all you've done!

anyways....
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: Tassieviking on March 23, 2022, 08:36:59 PM
It sounds like you need to convince someone to make a Paramix with a reverb circuit built into it, that might be a nice board that can be added to any amp.
I find measuring inches with a metric ruler hard too, always never on the line.
I find a small plastic ruler best that you can see through when I measure PCB's.

I found a nice Inches to mm guide online I downloaded.
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: pinkjimiphoton on March 23, 2022, 11:53:12 PM
that would be hip!

alright, i got measurements for ya...to add to those ya already had.
the input jacks center is 1" from the bottom of the chassis.
the standoff in the middle of the board is 1/2" high, and exactly at 7", the middle of the board.

from left of pcb, spacing for pots
3 5/16"
5 1/16"
6 5/16"
8 1/16"
9 5/16"
this gets weird.. 10 13/16", i have to have f'd that up somehow.
i used one of them transparent plastic rulers. the spacing looks the same, so i'd imagine it should be symetrical across.
sorry man. glaucoma sucks, makes it hard to see much fine detail.
di/headphone out jack is located 1 5/16" to the right of center of presence pot, and 13 16ths above the bottom of the chassis... slightly different from the input jacks height.

hope that helps. put the top on, and a handle i had kicking around. it's like, maybe a 3 or 4 lb 30 watt amp head this way. perfect for my old guy back ;)
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: Tassieviking on March 24, 2022, 11:51:23 AM
Sound like your back is the opposite to mine, my vertebrae between my shoulder blades have fused together to one solid lump of bone, and it tries to do that all over the place.
Soft connective tissue like ligaments and tendons start turning into bone, if my hole spine fuses and I fall it will snap.
To be honest I hate taking oxy, but I use it practically every day when I go to bed.
I never get a buzz from the oxy, not even when they fed me 32 tablets in 20 hours in hospital. If it is really needed for pain it does not give you a high, or maybe the pain was just so bad I didn't notice.

I have nearly finished the PCB now, just tidying up, then I will post it here for others to use if they want to.
I will make a different one later a lot smaller, with the sockets off the PCB, and maybe add an effects loop and reverb on the PCB.

But before I make this one smaller I will make one up for the Marshall 12 watt reverb
with an effects loop, I will combine all the 12 watt circuits I can find and add them all on one PCB, then just add the components you need for the one you want to build.
I will also make the power amp a mix of the 12 watt and the 30 watt one, again just use the right components for what you want.

Jimiphoton, you wouldn't have the measurements for the 12 watt amp would you ?
I would be after the spacing of the pots and pots to jacks.

Chers
Michael
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: pinkjimiphoton on March 24, 2022, 01:46:39 PM
Quote from: Tassieviking on March 24, 2022, 11:51:23 AMSound like your back is the opposite to mine, my vertebrae between my shoulder blades have fused together to one solid lump of bone, and it tries to do that all over the place.

owwww... i wish mine would fuse there, t8/9/10 have been busted 3 times now. i saw a surgeon about getting fusion, they said too much damage to risk any screws.  if i cough or sneeze unexpectedly, could turn catastrophic. at the least, its very painful. in a way, i'm lucky i've lost a lot of feeling, or i'd be in agony half the time.

QuoteSoft connective tissue like ligaments and tendons start turning into bone, if my hole spine fuses and I fall it will snap.
To be honest I hate taking oxy, but I use it practically every day when I go to bed.
I never get a buzz from the oxy, not even when they fed me 32 tablets in 20 hours in hospital. If it is really needed for pain it does not give you a high, or maybe the pain was just so bad I didn't notice.

its true. if you're in pain, you don't catch any kind of buzz. i've found the same personally, as have many friends and contacts. its amazing how misconstrued people in pain are, they treat us like junkies, when nothing could be further from the truth. most folks that have to take this crap wish we didn't have to, and that's a fact. if i were a praying man, i'd pray you find some relief, best i can do is send love and healing vibes. people should thank their lucky stars if they don't ever get to know pain intimately, for sure.

QuoteI have nearly finished the PCB now, just tidying up, then I will post it here for others to use if they want to.
I will make a different one later a lot smaller, with the sockets off the PCB, and maybe add an effects loop and reverb on the PCB.

i like that idea. kinda surprised you didn't go with a dual-mount for the darlingtons that would fit the more modern q's like you had done previously. if it had pads for either, it may make it more versatile, but it may just be me, cuz i'm really just an egg with amps.
the paramix circuit worked out great in the 12 watt with reverb! ;) relatively simple design, could be improved upon, i think it works better than the "stock" marshall one in this series of amps.
the thread for what i did is here on guitarpcb.com

https://guitarpcb.com/community/topic/been-down-in-the-dungeon-a-slavin-away-paramix/page/2/#post-23789

this one's getting it, too, but i'll be adding the series as well as the paraloop functions this time. i'd LIKE to add a spring reverb, too, but, may be a bit above my paygrade. been thinking of a belton brick based reverb, which would be a lot easier to do than a traditional spring one.

QuoteBut before I make this one smaller I will make one up for the Marshall 12 watt reverb
with an effects loop, I will combine all the 12 watt circuits I can find and add them all on one PCB, then just add the components you need for the one you want to build.
I will also make the power amp a mix of the 12 watt and the 30 watt one, again just use the right components for what you want.

if ya look, the 12 watt and 30 watt are pretty much identical, outside of speaker load! ;) 16 ohms, ya got the 12 watt, 8 ohms, the 20 watt "master lead" and 4 ohms, the 5010 lol...they're REAL close other than the preamps and drivers being slightly different. so that is a BANGIN' idea, bro!

QuoteJimiphoton, you wouldn't have the measurements for the 12 watt amp would you ?
I would be after the spacing of the pots and pots to jacks.

Chers
Michael

i DO, in fact! i got the 12 watt with reverb combo, which is similar but slightly different to the 12 watt headpiece in the micro stack.... and i have that too. do you need both, michael?
i think they're slightly different. i can get you pics, measurements, anything you need, just say the word, bro!

i will measure both today for you and post once i'm a bit more conscious. these really are my fav amps of all time, its funny, i can get more out of one of these weird little marshalls than i used to get with a 90 lb pedalboard <bernice, she's so damn big she has her own area code> and a *s!!t* load of outboard gear i used to haul. i was a fuzzface into a overdrive into a fender guy. i can get the same sound basically with the marshall and a guitar... usually a les paul or bmg red special, which is the one guitar to really rule them all. ever try one? they're nuts. i can get literally ANY guitar tone out of that thing... the on/off and phase switch for each pup really works, and you can do some crazy stuff with it... guitar feeding back too much? reverse the phase of the pickups, and the speakers suck instead of blow... not feeding back enough? reverse 'em and the guitar screams like a banshee. i love that thing!

anyways, gotta take care of a bunch of crud today, gotta gig tonite, but will try and get them measurements for you today.
stay tuned bro ;)
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: pinkjimiphoton on March 24, 2022, 04:20:55 PM
Michael,
here's the measurements for the lead 12 head,
pics coming. i did NOT pull the pcb, if you need that, let me know

the chassis is 12 13/16 long x 2.5 high by 6.75 deep

the pcb is 9.5 x 4, and sits a half inch above the chassis

j 1 center sits 9/16 from the left side of the board, j 2 center is 1 inch from j1 center
both jacks sit 14/16 above the chassis <so i guess subtract the 1/16th for the thickness of the chassis and then another 1/2 for actual height>

pots evenly spaced from jacks, 1 7/16 apart for all pots, line out also

jacks all read 1 inch up from bottom of chassis


apparently admin has crippled my ability to upload files. sorry man. i'll try and upload them on diystomps or something.

i guess i did something wrong? wtf?
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: pinkjimiphoton on March 24, 2022, 04:24:19 PM
meh
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: g1 on March 24, 2022, 04:56:40 PM
Quote from: pinkjimiphoton on March 24, 2022, 04:20:55 PMapparently admin has crippled my ability to upload files. sorry man. i'll try and upload them on diystomps or something.

i guess i did something wrong? wtf?

The whole forum looks very different since yesterday I think it was.  Some kind of update or new software I guess.  I would think there is some bugs to work out rather than anything particular to your account.
I don't see any means of attaching anything either.
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: g1 on March 24, 2022, 05:04:45 PM
Doh!  Big attachment button at bottom of text box.  :-[
But I get some kind of 'security error' message if I try to attach anything.
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: joecool85 on March 24, 2022, 05:17:19 PM
Quote from: pinkjimiphoton on March 24, 2022, 04:20:55 PMapparently admin has crippled my ability to upload files. sorry man. i'll try and upload them on diystomps or something.

i guess i did something wrong? wtf?

Nothing done wrong, we updated to SMF 2.1.1 and lost certain functionality.  I'm looking at this now.  Sorry for the trouble!
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: pinkjimiphoton on March 24, 2022, 05:42:28 PM
Quote from: joecool85 on March 24, 2022, 05:17:19 PM
Quote from: pinkjimiphoton on March 24, 2022, 04:20:55 PMapparently admin has crippled my ability to upload files. sorry man. i'll try and upload them on diystomps or something.

i guess i did something wrong? wtf?

Nothing done wrong, we updated to SMF 2.1.1 and lost certain functionality.  I'm looking at this now.  Sorry for the trouble!

thanks joecool!
i was afraid i angered the forum gods or something!!

btw.... i think this is the stuff i'm gonna go with for the front plate on the amp. gold or rose sparkle, not sure which yet... they do engraving and everything if you need it, too.

i'm LOVING this little amp. the whole thing in the chassis only weighs about 4 lbs!

https://www.jpplus.com/rowmark-colorhues-glitter-cast-acrylic?sku=GH341771-QTR
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: Tassieviking on March 25, 2022, 10:55:29 PM
That is....sparkly
Those are very big glitter
I think I will use an aluminium panel and plain old gold spray paint can when I make my Marshall front panel.

This is a test panel I sprayed with the cheapest satin gold paint I could get at the hardware store
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: Tassieviking on March 27, 2022, 04:56:42 AM
Here are my KiCad files for the Marshall 5010 PCB78-2

The heatsink I would use would be :https://au.element14.com/aavid-boyd/505403b00000g/heat-sink/dp/1313918?st=heatsink%20to-3
Or just make one out of aluminium yourself
The Schematic does not match the board files in KiCad as I changed it slightly to make the PCB, I removed the transformer, switch etc.
I think it is the best I can do for now.
 I might make a smaller PCB in the future with the Jack sockets off the PCB, and add an effects loop and maybe reverb as well.
I will not be making this PCB myself but it is fairly close to the original.
The strange capacitors are a mixed footprint so you can use Tantalum, Electrolytic or WIMA box type for the 2,2 uF caps.
The PCB will accept Alpha 24mm pots like the original, or Alpha 16mm pots (The holes will be lower on the front panel with 16mm pots.
Michael
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: pinkjimiphoton on April 01, 2022, 08:14:47 PM
i ended up using copper foil shielding tape for a front panel.
thanks for all this, michael!!

i got dimensions for the 3005 reverb for you...

chassis is 12 7/8 long, 2 3/8 high and 6 7/8 deep

board is 10 wide by 5 3/8 deep, sits 7/16 up from the chassis

input jack is 1 1/8 from left, gain knob is 1 from that.
all knobs are 1 1/8 spaced, line out is 1 1/8 from reverb knob, hp jack is 7/8

gotta upload some pics, will post soon

the new amp is totally clean and appears original
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: pinkjimiphoton on April 01, 2022, 08:49:58 PM
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Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: pinkjimiphoton on April 01, 2022, 08:52:08 PM
more

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Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: pinkjimiphoton on April 03, 2022, 06:54:40 PM
tassieviking, just measured the dcr for the onboard reverb, input reads 32r, output 200r

pics of trace side coming soon
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: pinkjimiphoton on April 04, 2022, 02:18:16 PM
here's more pics, of the trace side of the board.
i DID do some mods to this... 10,000uf power supply filters, and 220uf filters for the preamp instead of 100uf. that made it a bit quieter, and more robust. above 220uf and it gets kinda unstable, it needs a little sag to sound best, and above that too much bass leaks into the reverb and makes it so your attacks get kinda "pingy".

anyways...
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Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: Tassieviking on April 05, 2022, 09:56:18 PM
This is circuit as I traced it from the pictures, very similar to the online circuit for the 5205 with a few small differences.

The C12 in parallel with R17 is actually C16

The tone controls are connected slightly different

The power rails on mine are 24 Volts, ignore this as its approx 21 Volts.
KiCad only has 15 Volt or 24 Volt symbols and I haven't made any 21 volt ones yet

Your Bridge rectifier is different number then Marshall drawing, but both are 1.5 Amp.

That's all the differences I found from the original schematic.

Michael
Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: Tassieviking on April 13, 2022, 06:53:17 AM
Here is a crazy thought Jimi, what if you put the 5010 amp and the 5205 amp side by side, and wired the pre-amp of the 12 watt reverb to the power amp of the 30 watt ?
Go from pin 1 of IC2 of the 12 watt and go to C8 of the 30 watt.
Just to see how it would run with the 30 watt amp attached to the 12 watt pre-amp.
I think I will just make a picture up so it is easier to understand. =)

Title: Re: does anyone have a schematic for a marshall 5010 jm78-2 pcb?
Post by: pinkjimiphoton on April 20, 2022, 01:17:01 PM
i love the way your mind works, mike!
i may give that a shot, soon, hopefully... finally gotta production batch of pedals i gotta get done first tho.
it should work fine that way i'd imagine. i'll definitely try it and letcha know, bro!
thanks for all you do, man. its seriously appreciated!

i just put the schematic you made for the 30 watter on the marshall forum. you just helped a lot of people out, bro... thank you!