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Kora Galaxy 6AS7 Class A Tube Home Stereo amplifier No output Preamp tubes dead Interesting Repair



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First one in the shop. These high end tube amplifiers are made in France. A cool looking design, however based on a circuit board which will generate problems. The owner had no luck locating a service shop until he found me. At first, I was not sure if I should take it on, but knowing that I'd never see another intrigued me. So here it is! Well I located a major failure and thought that would take care of the issue. Turns out that the amp had the incorrect preamp tubes installed. Since I had no service data, I didn't catch it initially. Later on after some web research, I discovered that the original preamp tubes are 6922 (ECC88) Not ECC83's. Completely different tube. Yep, got me and resulted in wasted troubleshooting time. So, at this point, I need to locate a set of the correct tubes, then resume the task. This will be followed up on part 2. I thought today would be an easy one, Nope!
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Audio
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