Update on the this Nikko unit.
As mentioned, the biggest issue was corrosive glue. I did end up replacing quite a few components, not all were affected but once I pulled something out to check, I put in a new part rather than the old.
After getting this unit working, I was testing and found the reed relay introducing some distortion into the audio signal. I don't know how this happens and I couldn't find a direct replacement and so I bypassed the relay entirely. I should have taken a screenshot, any steady freq sinewave showed the distortion. If y'all have any insight into that, let me know.
Unfortunately while testing, I had pulled too hard on the scope ground jumper. Naturally, the grounded jumper fell right on the powered board and blew both the output transistors. I'm just not careful enough sometimes. So I had the pleasure of replacing both the output transistors, and the gain on those replacements are about double of the OEM's. I checked the input vs. output gain, and it's all right on - but that being said - it's spec'd to do 1v output at full volume and man, that's high. I can only get the volume control to about 9 or 10 o'clock before the db's are quite high.
So I'm looking at how to attenuate that signal output (like the carver C-1) and the unit should benefit from a lower noise floor. And I'll get back a bunch of useable volume knob control.
The pictures show all that nasty glue cleaned off and new components installed (more than really needed but we like to strike while the iron is hot!)
Oh, last pic shows the beauty mark this unit has. I like it.
