This is the thing with vintage amps and boards especially class a, boards are fragile, solder joints need reflowing etc. Just to make sure i went...
I wasn't too sure myself but that's where my issue was coming from, something ksut wasn't right in that specific area, whether this was due to...
@PTS all original output transistors from factory! If you can find some original transistors that would be great, the same transistors were used...
Again correct, once I did this my amp actually ran cooler!
Also look at the picture of the traces, zoom in and if you know what you are looking for you can see where the traces are bad, if you were to...
You are correct about this protection circuit and its not improbable about the issue I had. It just a process of elimination and I've come across...
[img] One other issue I had come up was a very strange buzzing coming from the transformer, it just felt a little loud and like it was...
Well that was helpful. If anyone has a temp gun or the ability to measure temperature could you please measure your hestsinks let me know what...
I've read through this before and it's not very helpful for actually setting up the bias. Has anyone on here actually taken temp readings based...
Guys what bias have you set yours to? Service manual says 850mv but I feel that's too much, my heatsink temp went to 74 degrees on idle! Has...
Decided while inside the amp I would add cooling fans, got some 40x40x10mm 12v fans which fit perfectly inside the heatsink under the circuit...
One thing to worry about is shorting against the relays and the AC mains connections. Decided to 3D print some covers: [img] [img] didn't have...
Lets install new rca connectors and speaker posts [img] Pull out and drill old rca out [img] [img] [img] [img] [img] Bus bar original...
https://imgur.com/a/qILrnu6 Had to match the hfe closely then make sure they were thermally bonded to each other. A992 transistor.
hahaha because 3d printed holders wasn't good enough already? Access to a cnc lathe/milling machine is limited presently. Maybe in the future, at...
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