I have some older solder (among various types and ages)

seems like it would be awesome due to the diameter

but maybe it is so old the rosin stuff inside has degraded?

the reason I ask is everytime I try to use it I get awful crumbly crap. it will every so often behave and melt nicely but then mess up again.

I thought maybe it was just the end of it exposed to air amd moisture maybe it would get better but it hasnt.

hate to toss it but I cant get it to work.  I have other stuff that works good.

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thanks for your help

well guys apparently hell has frozen over because I ordered some 7808ct voltage regulators
they had different letters and stuff and i didnt understand the differences so i got a few different ones.  digi key had a $4.99 ship for light orders so I jumped on it

in honor of hell freezing over....I leave you with this

sorry had to add a few thoughts about the tapes

the home copied tape labeled "Ratt" has a version of walkin the dog that really rocks \m/

the MSG tape is killer...really a shame he/they were not more successful in the states

Aerosmith Night in the Ruts....totally rockin...a couple songs have a real Led Zep Presence vibe big time

Foreigner double vision...got CRANKED BIG TIME...some killer songs....man what memories...

VH Fair Warning....what can you say....does it get any better?

Priest Defenders....wasnt really entranced by it....there are a couple songs that TOTALLY SHRED wow I presume its Glenn putting on a clinic  some of the parts my jaw hit the floor 

yes sir thanks for your help
I appreciate you checking up on that

I need to get those new ones in thats for sure sorry for the delay

I actually found a box of old NIB RS components in a thrift store today and sifting through it was an LM317   

bought a few tapes today 


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my high end system 

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the tape lower right just simply said "Ratt"

did not power on
found an open fuse
replaced fuse
put on dbt looked good
powered on but has no trace

crt is glowing a little but not much

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the slide switches are extremely stubborn

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you practically need a hammer and chisel to move them

 

I am aware there are crazy high voltages in these things so I havent fooled with it   

this is how i had it...exception being I had grounds hooked up to the tab on top...idk 

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thanks for your help

alright guys I desoldered a resistor a d measured it at 1 kohm....seemed maybe too high.
I then made up some jumpers from odds and ends...hooked everything up..put my multimeter on each side of the resistor...8.05v....dang it 

so i am extremely interested in seeing if I can get a good ground on that center pin when the replacement is soldered back in circuit.

frustrating..but this has been a good experience...thanks for your help
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thank you sir that thought certainly did occur to me much like many things that test ok without a load and fail with one.
I am ordering a couple new 7808 but dragging my feet trying to assemble a large Mouser order to offset shipping.
I do not have any resistors on hand but def have some junk laying around where I can desolder one and use it.
thanks

hello ssguitar enthusiasts

I am ordering some components as listed in an old lab book for experiments.
Listed are transistors, scr, diodes, resistors and capacitors

I am familiar with electrolytic capacitors as most are polar and marked as such..seems like for a breadboard I would want capacitors that can be installed either way?
maybe film or ceramic?  maybe price will be a consideration idk

I am assuming the diodes and resistors will not need to be anything special or unusual.

thanks for your help I have some Jameco breadboards.

regards
Wesley

hello friends
Im thinking I made incorrect measurements or something..maybe there is an insufficient ground...(I dont know anything...just guessing with my limited knowledge)
anyhow since 7808 seems to test ok out of circuit I will put it (or replacement) back in and test more points.
I really have a feeling this is going to be something really stupid like a deficient contact....ground...switch...jack...idk.

thanks again you guys rock !!

hello ssguitar friends

since this device seems to test good out of circuit I am venturing that I did not measure it correctly in circuit....I dont remember where I had ground..I likely clipped it to the metal chassis...
anyhow my new rabbit hole is going to be learning about ground(s)

thanks again

well hell.....
I hooked everything up...wish I could post some pics

as soon as I turned the power supply on my meter was showing 8.03V
so I guess this little guy can work when its not soldered in the amp...idk smh 
so back to the drawing board...or schematic...
on the plus side this was lots of fun damn I learned a lot in the last few days....
just wish I had a different cadaver to pract8ce on because I really love this amp 

so thanks guys dont bail on me yet ha ha

thanks guys it is helping to actually do stuff in real life instead of just calculating current and voltage drops. 

just an FYI of my thought process....last night I had wondered if I could connect it to a 12v battery (automotive) immediately I was horrified imagining 650-700 CCA vaporizing the little device and kinda breathed a sigh of relief that I didnt do that.

so then this morning on the way to work I got to thinking...in my boat I have a big ass dedicated 12v deep cycle hooked to one thing...a Lowrance sonar.  and its not drawing hundreds of amps or glowing red from current. (lots of times I run sonar with the outboard off and so I have a separate cranking battery)

so I kinda came to my senses about this...I think my thinking got corrupted by imagining a variable power supply could dial in any current...maybe it can idk..

so anyhow I am going to take a 12v batt or power supply and connect to pins 1 and 2....then connect multimeter to pins 2 and 3 and see if it reads 8v.

also I plan to connect the DUT to a heatsink before testing

it also occured to me that this is precisely what Mr Tassie Viking instructed me to do while it was in the amp (thank you sir!) 

hey guys when people at Peavey dumped hot glue on components was that supposed to act as a heat sink?

thanks again
    

resistance across C58 about 3.5kohm