If you want it done right bring it to Ben he is the best by far.
Audio Research VT-100 repair
Ben Jacoby is excellent but a bit our of the way in Brooklyn. I'n in Manhattan, Need someone to troubleshoot and repair a noisy left channel. Would consider a serious hobbiest whose adjusted the plate voltage of the driver tubes (assuming that's the issue) Just replaced the 4 driver tubes and the power tubes seem fine.