Not sure you remember but I had previously asked if you could put together a replacement parts kit for this amplifier. I have a local competent tech with 25 years experience that can do the work. Let me know. You have taken cinsiderable time and effort on these integrateds and I am sure many would suggest it's not worthwhile but I commend you for your efforts and really enjoy your sharing it all with us.
Nice work so I guess the question is does it sound good? And what are your thoughts on it relative to the germanium 2000? I haven’t heard either but have a soft spot for the germanium sound.
You are a wealth of knowledge for these gems, I appreciate your effort in keeping them going. I have one of these that I re-capped a couple of weeks ago. It seems to work well and sound good 99% of the time.... It's pulling shop music duty connected to a pair of dayton bookshelf speakers. About every 5th or 6th time I turn it on, I'll get a 60hz hum on the left channel and the two wire-wound resistors for that channel get smoking hot. If I turn it off and then back on it seems to correct itself and work properly. Heat sink runs about 102F - 110F the whole time usually a few hours at a time. There was no heat sink compound on the main outputs between the heat sink and transistor body, I used the same stuff you use and the same method as you video, also replaced the mica insulator with new ones. Does this sound like a short between the transistor and heat sink, or something else? I would appreciate any direction you may give. Thanks for all the videos!
I've had that same issue with a KA-2000. It was a leaky 2SC984 NPN driver transistor turning the bias circuit "full on". I replaced it with a 2N2222 with a 100pf anti-oscillation capacitor C-E.
