Scottfer55
Member
Hello, Im posting this thread in hopes of guidance through a restoration of my A-700 amp I purchased new while in the navy back in 1983. The amp has been sitting untouched since 2003, it was working but had sound issues, dim and some not working lights. I brought it to a tech and was told then that it would cost more to repair than what it was worth. Ive recently decided to try and restore it myself. Progress will be slow and I will be learning as I go along here. Ive sorta taken on this project for a few reasons, one is to be able to listen to this fine amp once again and another is to learn about repairing electronics gear. As of today I have disassembled the amp, found that old nasty glue and associated corrosion, removed the 2 caps with glue on the main circuit board and found some questionable resistors due to the corrosion. I left the transistors attached to the main circuit board and salvaged the mica ? plates that are between them and the heat sink, however one set hasn't come off and i don't want to pry it risking breakage any suggestions on separating plates and cleaning the old paste? I started to reflow a few of the solder joints and i think i'm doing ok with that, see pictures. Im also in the works of getting a dim bulb tester made up. My plan is to reflow all solder joints, reassemble and test.
If successful Id like to replace the caps that may improve sound quality.
Here are a few pictures
How do these re solders look?
Should I replace any of these resistors with corrosion before testing?
How do I remove the mica plate without damaging it and how to clean old paste?
Thanks, Scott
If successful Id like to replace the caps that may improve sound quality.
Here are a few pictures
How do these re solders look?
Should I replace any of these resistors with corrosion before testing?
How do I remove the mica plate without damaging it and how to clean old paste?
Thanks, Scott