Menu

Show posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.

Show posts Menu

Messages - solidstate2199

#16
Hi Enzo,
please dont get this thread confused with my other thread about the 2199 amp.
This is about a 5010 which has exactly the same symptom as the one that user
memoryman had. amp is a 5010.

no the squeal dont change with moving. its an electronic feedback squealing not acoustic.
thanks.

i guess i just have to bite the bullet and change the jack right away.
im just interested why the squeals goes away with changing to a longer cable
or putting a stompbox between, i guess it has something to do with impedance.

inside the amp looks all original to me no-one in there before.
man and i hoped to just play the damn thing...well out comes the soldering iron ???

no not the same circuit at all, the 5010 is the 2nd generation master lead 30w, 2199 1st generation. circuits are similar though- sound of 5010 is lightyears ahead!
more clarity, more bass, no mud att all like 2199s.
But the 2199 is very good for non-distorted to crunchy 60s music, distortion is a "bad!" joke on 2199. the 2199 distortion is like "real distortion" it gets bad pretty quickly.
i hope i can mod 2 of my 2199 amps to 5010 specs, the boards look very similar infact, i think its possible.
cheers
#17
I have to dig out this thread because i recently acquired a 5010 Combo and
i have exactly the same symptoms.

I thought it had loose caps or otherwise loose stuff in it but nada.
So bassically only if i plug any guitar into the "High Input" and turn up the
preamp gain to 9 to 10, so full on distortion, it starts the squeals.
These squeals change pitch and intensity if i change volume and tone on guitar.

But here is the thing why i dont suspect the input jack, first i put a distortion box
between my guitar and amp- the squeal goes away - any distortion box or even a buffer pedal.

If i take a 8 foot long cable - the squeal goes away!

But am not happy with it because i can feel that with the shorter cables and direct in the amp is way
more brighter and more aggressive which i like...so bassically high frequencys get lost with long cable or any
stomp between it.

Can it still be the Input "Cliff" Jack, or a broken solder joint on that jack?
I have one here so i could change it right away...coulkd it be the jack or does the long cable proofes
different?

Like always,
thanks for the help guys!

( I already cleaned all the Jacks with good contactspray and tapped all components
with a wooden chopstick while running the amp in "squeal" mode, no reaction so
i guess either component values have driftet significantly or the damn cliff jack is the
reason. i read these jacks have some type of overcoating which is bassically part of the
signal-way, so if the coating goes, the signal is affected...its still weird because longer cable
or stompboxes stop the squealies! but my amp makes exactly what the other guys amp does, i hope its just the jack.I really start to think about not buying over internet anymore, i mean only pickup and test before buy!
#18
Just a thought...if i wanted to go ape crazy on this amp
and had a complete preamp makeover in mind...how
hard would it be?
Following preamp would be the final goal...Marshall 5010
Master Lead from the 1980s.
As opposed to the 70s Master Lead the 5010 is a transistorized
version of a JCM2203, at least it really sounds close, without the
big bottom and with a little more fizz, but its really good,
not like the 2199 Master Leads (hard bag of sh...es).
I guess the power section is almost exactly the same...
could somebody have a look over both schematics?
I only know that the 5010 use Ic-Opamps which make a very
good distortion sound.

5010 schematic
http://www.drtube.com/schematics/marshall/5010.gif

2199 schematic
http://www.drtube.com/schematics/marshall/2199.gif
#19
Played around with the 2199 a little.
I now think that the lacking presence of the
Amp is a design "fault" in the preamp section, and
not related with the cabinet or speakers.

I plugged in a Valvestate Head via Effects Output into
the Mix Input of the 2199.
Kept the preamp volume on the 2199 very low to not
overload the Input.
Well now there are enough highs and presence delivered
over the Speakers.

You guys gave me some mod tips on the preamp already, i guess i
will try some.

Bright cap on the Input first and go from there.
#20
Hi in my opinion yo should leave it as it is, more gain will spoil
this amp. All you would get when adding more is the sound like one of the smaller 90s valvestates, these can be bought all day for very small change.



#21
Hi Phil
thanks for the thoughts , keep them coming i will refer to all of them when (if) modding
time comes. Still evaluating the Speakers/cabinet size.They are sized like the 1936 series
minus the Amp on top.Idk they just dont sound right no matter what amp i try, something happens in the upper mids to highs which mud up the sound.

As for design flaw, its only one of the amps which has the noise and radiofrequency interference,
on the other 2 every inputs work fine.

I think these amps where designed for giving the nice overdriven crunch. It was the mid 70s,
nobody would have böught a clean only amp these days, Marshall knew exactly what they wanted,
and to my ears the got pretty close, these amps sound definately like ripping Marshalls, it just needs fine tuning. Marshall ad of one of the 70s transistor heads said " transistorized Head specially
designed to give you the sound Marshall is known for" something like that. They were going for the sound. Off course, it wont be transformed into a JMP2203, mostly the bottom end will
lack, but the basic sound is there,the roundness of the notes and such, just the "whiplashing" has to go.

Unfortunately, im no pedal guy-at all. I noticed that the physically smaller everything gets, the
more small and compressed squished it sounds... i know lots of people dont believe this and say
only component value counts...to my ears if you want big sound you need bigger sized components.I dont like fiddling with other stuff than the amp itself while playing.

Second this Amp hates pedals. I really have to put up some soundfiles so you can hear what im talking about, if you turn the preamp gain up to high it sounds " whiplashing ".

I wonder if the 2195 and 2098 heads have the same problem, i heard one demo on youtube and
there the problem doesnt exist,but its always different if one sits in front the amp. maybe checking the 2199 schematic against the 2195 will help.

https://www.youtube.com/watch?v=Xu3FtoG3Vyo

Thanks guys i appreciate the help.
#22
Thank you all for the good tips, i will report back when the cap is installed.
At the moment i still test the sound of these amp, today i rewired the speakers on
one of the 2199 combo with an speaker output jack so i can use it with other amps.
i found out that the to my ears kind of unpleasant sound is partly due to the 2x12 construction...maybe im just not used to it but it sounds kind of muddy to me.Maybe they need more Volume to open up the treble frequencies like my 4x10 Marshalls, they have a good treble even at low volumes...i have more testing to do before i decide to mod these 2199 amps, i have to try the 2199 with a different cab to really decide.
plus they all sound different to begin with( i have 3 , got them cheap)

At the meantime has anyone tips on the grounding issue (remember the radio signal and the higher noise floor is only on the normal input and the bright input..not on the mix input, this one has no unexpected noise and or radio interference)

yes the resistor mod is bassicaly like its in the schematic, i saw some of these amps who had the mod and some dont i guess its marshall factory, different revision.

i discovered a picture of one with a blue circuit board (made for us market)...never seen this in a marshall. i guess its a blues amp after all 8).



Also i would like to understand how the overdrive in this amp is achieved.

i read an article from rg keen on different ways to create distortion, but to be honest
even this was hard for me to understand even a little, im no technical guy.
There is no Led diodes or op-amps in these amps like later marshalls, so is it like overloading
transistors which create a cutoff for the signal or compression?
i like the sort of "crispy, krackly crinkly not really sustaining type of distortion", sounds like ripping
or crumbling paper with your hands, but on these amps it gets too harsh
at a certain pre-gain setting.
#23
Thanks for your help, i will replace the cap with a 2200uf/63v and hope
that it remedies the oscillation.

Since i thought about modding the amp to get an overall brighter and more present sound,
should i start with a different cap value at c17 or ist this strictly a decoupling cap
which hasnt much impact on the overall sound?

I know at the moment that i should up the c5 value from 0.22uf to at least 2.2uf to thicken up the
bright channel. Bassically it will become exact like the normal channel...this is not much of an
improvement on these amps. What i want to achieve is that more highs from my guitar reach
the speaker, these amps are dark, dull and somewhat nonpresent sounding.
The Distortion sounds ok if you set the gain on the verge of breakup...more than that and
it gets an unpleasant mess if you play more than 1 note...but i will explain that with soundfiles
if i get into the modding thing.

The other 2299(same with reverb and much more gain) has a problem with radio interference and overall loud noise floor...
but only on the normal or bright input...the mix input is reasonably quite and sounds not too bad up
to a certain preamp-gain setting where it gets harsh and muddy.
Unfortunately no schematics available for the reverb version.
#24
Hello
i know there are one or 2 threads for the 2199 already, but i have some mod questions in
the future where i will use this thread..

I bought the 2199 some days ago, mainly for the speakers (G12K-85) and to use as a 2x12, because
i previously knew that these amps dont sound good. They are playable clean, and even then these models seriously lack presence. The build in overdrive...well i come to that later.

I played the Amp a little for testing purposes and there is an electronic high frequency oscillation.
Bassically on all 3 channels, on the normal not that much but just because this channel doesnt have much highs to start with. When i plug in the mix channel and turn the treble up past 6 and the bright gain up the amp starts to squeal like a dirty pig, the oscillation changes pitch and attitude when i change eq or gain settings. When nothing is plugged in , theres no oscillation, i read somewhere thats because the cliff jacks shunt the signal to ground.

Alright, i opened the piggy up today to find a siemens capacitor roaming free inside the amp housing.
Its C17. Question: on the photos you can see white gunk on 2 green electrolytics and the free space where C 17 belongs. Is this Marshall Factory glue or innards from C17? Why is the Amp still working
without that cap, what is it supposed to do, please understand i have no clue about electronics.

There is some circuit changing on the right side of c17, the leg of one resistor is connected to the one
beneath it and a tantal cap is piggybacked on top of it. I believe this mod is factory  because i found 2
pictures of 2199 innards on the web and there is the same modification made.

There must have been someone in there before me because 2 speaker wires which where
originally hardwired to the speakers where modified with a cliff jack mounted inside the chassis.
But i doubt that the cap was loose at this point. I dont really see any burnmarks at spot C17, maybe
on one side i dont know. Could the Cap be torn off while shipping? because the seller typically for
old stinky Marshalls only wrapped a little cardboard around and called it a day :duh

Also the schematic says C17 1000microfarad/ 25volt and the one found in the Amp saz 2500/35
but i suspect this is the Marshall factory C17 because i have other 2199s with the same cap.











Regards