The guy who sold it to us was old and while I'm sure he knows his stuff, it does look like he had difficulties holding the iron steady
No dice. I found one bad resistor, one broken connection and a few capacitors that have not been replaced. Made a parts list for the next parts order. I'll have to recheck every connection, every part, test the tubes, and align it. So basically the whole program. Will be fun!
Second one has been worked on within this century! Interesting, so why is the case so dirty then and what's with the bomb?
The dial indicator is stuck on one of them because the bulb melted the plastics.... fun
I decided to work a bit on the RA-25U. The small one that's been worked on before. All iffy capacitors had been replaced, except one was missing completely and, well, the filter caps.. the schematic calls for two 50μF caps, which are the two sections of the electrolytic can. Since that is bad, they were replaced.. One with this 22μF, the other with this red paper bomb. Why?? Very much looks like a replacement done in the 60s or so. Why leave this in? I don't get it. Of course it was humming.