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Hello tube lovers, I just got my first tube amp and found that somebody worked on it extensively in the past. The traces got a little reworked and some resistors and capacitors added on. I've researched this amp a little bit before buying, but I've never seen this type of work. I haven't plug it...

Hello, I have a Pioneer SA-7500II that I recapped a while ago, plus changed the output transistors with MJ15032 and 33. I measured the voltages from the output transistors and compared them with the service manual. I found that my amplifier has lower values at the base and emitter. I attached...

Hello AK members, This is my first thread, so if I'm doing something wrong please let me know. I'm pretty new to this vintage stuff, but I already like it a lot. A few months ago I bought my first vintage amplifier: Pioneer SA-7500 II. After I bought it I found that this isn't one of the best...