Soundcraftsmen Rebuild

jbeckva

Admin/Server Dude MAA Guy
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Powhatan, Virginia, United States
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WassupYa Mang?
#1
Took on a job to do a total "redo" on a little SC guy here - A2502 that is a MOSFET design that'll do around 125 per channel. Pretty nice build to work with.

Took the amp boards themselves first, and repopulated with Muse/FG caps and ditched the carbons for metal film 1 and 2 percents.

halfwayamps.jpg

Then tackled the rat's nest wiring..

IMG_3925.JPG

And definitely found a bad actor here, with the negative res cap leaking spooge all over the place. Glad we caught this guy in time.. would have been a real mess with it going critical..

capbadguy.jpg

So.. with amp boards rebuilt plus with 14 and 16 AWG milspec, we're at this point here. Awaiting parts - the speaker switches with what would seem a few PMA's (prior maintenance actions) were on their last legs. They were rated at 1A as well.. got 10 ampers on their way.

Also bypassed the front level controls. If the customer agrees, that's one thing to ensure we have as clean a path as possible. Redid a few things on the grounds as well - the original design had the whole, single ground on each amp PCB routed up through twisted pair wiring to the level controls and THEN over to the cap ground. Instead, we're going right to the speaker grounds and via heavy jumpers on the other grounds going right to the caps. The inputs are now wired direct and with some killer Nav-provided single core coaxial mini-cables.

wiringitup.jpg
 

WOPL Sniffer

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Minnie-Soda
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Screw it
#3
In the first pic, is that "Haze Grey and Underway" paint on the bench or is your wires leaking alien goo????? :eek:
 

jbeckva

Admin/Server Dude MAA Guy
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WassupYa Mang?
#4
Hah neither.. the workbench has seen a lot of work over the years. Not sure what that was LOL. Underneath it is one of those USB "scope" adapters that was supposed to make your PC an O'scope. Didn't turn out that way hehe.
 

jbeckva

Admin/Server Dude MAA Guy
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Joined
Jun 11, 2010
Messages
6,842
Location
Powhatan, Virginia, United States
Tagline
WassupYa Mang?
#6
Ok, she's buttoned up and ready to go back to her owner. Was a fun build. Listening was not too shabby.. good enough to rattle a few windows. But yeah, not a WOPL lol..


Finished-2.jpg

Finished-1.jpg

Finished-3.jpg

Here's the required "jamming" at the end vid..

 
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