JMP 50 Gut shot (Now Sorted)

normula1

Does anyone have a decent gutshot of any early '70s 4 input JMP 50 with the ST1 PCB? I'm specifically looking for a 1964 Lead and Bass model but any of the other variants will do as I'm primarily interested in which holes in the pcb are used for the fly leads.

I'm returning my amp to fully stock (it's currently around 90%) and have yet to decide whether to do this on the original PCB or to go the whole hog and fit one of @Modulus_Amps turret boards and start afresh. Originality is of a secondary concern as the chassis has more holes than a Swiss cheese..... it was the '90s and these things were just considered old and ripe for tinkering with.

The pictures on t'interweb that are of the correct era all seem to be from weird angles and / or blurred, and of course when I did the full two channel fire breathing monster mods back in the early nineties I neglected to take a photo first. Come to think of it, I'm not sure I actually had a camera back then

Also why is it that none of the kit suppliers seem to sell the 330uF V1 cathode bypass capacitor? I created a BOM in case I wanted to go the whole hog route and whilst I can get that cap from RS easily enough it seemed a little strange that the kit suppliers seem to sell everything else bar that one.

ICBM

This not clear enough?

http://music-electronics-forum.com/attachments/29545d1404668799-1964-jmp-lead-bass-50-watt-head-ca-74-7.jpg

DJH83004

Pretty sure I must have as I photograph everything I ever repair,  and have done lots of JMP 50s over the years it may take me some time to trawl through all my folders, but will keep you posted.

normula1

ICBM said:

This not clear enough?

http://music-electronics-forum.com/attachments/29545d1404668799-1964-jmp-lead-bass-50-watt-head-ca-74-7.jpg

That was the best I managed to find. It's OK on a screen but not great when printed. I can't help being a perfectionist

Modulus_Amps

have you looked through the photo collections on this site, they have photo's of just about everything older

http://www.amparchives.com/

have you got the ST1 board there?

Cheers

FelineGuitars

Good one in Dave Hunter book

fastonebaz

Here's some of my 1969 jmp super pa 4 input head



Marshall JMP super p.a. 100w https://imgur.com/gallery/hXDb0

normula1

Modulus_Amps said:

have you looked through the photo collections on this site, they have photo's of just about everything older

http://www.amparchives.com/

have you got the ST1 board there?

Cheers

Thanks @Modulus_Amps, that's excellent. The site as fast as the average three legged tortoise to load but has just what I was looking for. In fact one of the amps shown has a serial number only 39 away from mine.

I do have the ST1 in front of me.

john_r

This is my old JMP 50, ST1 but a later revision, may be of some help? Got a couple of shots from other angles if needed: https://imgur.com/a/pLnbh