High f squeel the owner could cut out by dropping the 5K graphic to bottom. With graphic as normal he also found that touching 1/4 inch jack ring to chassis would stop it. Of couse no appearance in my hands. Mains ground is properly bonded to chassis, I've not yet found where amp 0 is connected to chassis though it is (at the moment) , insulated bush 1/4 inch jacks throughout. Known issue with these ? I'm assuming the crosslink point, wherever it lies, is lifting intermittently. I note the coachbolt through the toroid is not making electrical contact to the chassis , thru the paint , so maybe similar wherever the amp ground is , DI XLR con perhaps. Not yet , testing per section, taken apart yet.
12 years ago