Well whoever had this amp definitely did a number on it.... not only is the chassis scraped and dinged to hell, but it looks like someone got a wonderful idea to clean it with a solvent.... then to make matters worse they tried to repair it.... 😱.... so here's what I'm starting off with, after most of the TIM has been cleaned off...
thanx for checking it out.... I'll update periodically.... Keith
The screening I will farm out to someone....the sooner I locate someone the better....keith
Very interested to see how this turns out. I just bought a PPI A300 and its in horrible physical and functional shape. I can get her going again but the cosmetics I'm not always so great with. Do you know of a person who can or has recreate the Art series graphics? I considered stripping the heatsink to bare aluminum and having it polished.
I am about to set up a silk screener to do some amps, usually the initial cost is the expensive part.... I'll let you know when I get it set up.... also another option is to buy a fried amp with a good chassis and swap it out.... Keith
Finally have gotten around to doing a little work... I want the restore to be as factory as possible and needed to replace the part BYW29F-200 and found a supply of them since it's been updated... so here is the board after the defective parts had been removed and the CB cleaned up a little from someone else's handy work...
All four will be replaced even though it appeared only one had been broken and the leg re-soldered...
Subscibed with intrigue.
Great to see someone else is seriously restoring these treasures.
Keep up the good work.
Note-Looks like the cap on the left in pic exhibits evidence of leaking.
I agree and since it's on the table i am gonna recap it also... i have been looking through your restoration thread frequently Bret... it's what got me wanting to chronicle one myself...
Looking good so far man. I got my A300 going again. Still kinda ugly outside though. Hope you don't mind if I post a few pics. If its a problem I will remove them.
Before repair:
After replacing the toasted power supply fets and gate resistors:
I could have picked an amp to restore that was a little less f'ed up.... It took me a while to figure out what the original problem was, but while looking for it I found several other problems... a small tracing at the end of the rectifier was severed...several of the caps vias were missing and part of the power IC's solder was missing.... so I have jumped the tracing, replaced all the FETS and rectifiers, replaced all the caps including jumping the pulled vias...and lastly I replaced the ps IC.... low and behold the amp works... Keith
I could have picked an amp to restore that was a little less f'ed up.... It took me a while to figure out what the original problem was, but while looking for it I found several other problems... a small tracing at the end of the rectifier was severed...several of the caps vias were missing and part of the power IC's solder was missing.... so I have jumped the tracing, replaced all the FETS and rectifiers, replaced all the caps including jumping the pulled vias...and lastly I replaced the ps IC.... low and behold the amp works... Keith
Restoration Log of a PPI Black ProArt 25
...are you going to do the screening yourself or farm out?
Linear Mode
