- Joined
- Jun 11, 2010
- Messages
- 6,842
- Location
- Powhatan, Virginia, United States
- Tagline
- WassupYa Mang?
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.
Then tackled the rat's nest wiring..
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..
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.
Took the amp boards themselves first, and repopulated with Muse/FG caps and ditched the carbons for metal film 1 and 2 percents.
Then tackled the rat's nest wiring..
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..
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.