Last year I built a 6G3 Brown Deluxe clone. When cranking the intensity of the bias wiggle tremolo up, it has what sounds like a rather unpleasant blocking distortion. I wasn’t able to get it under control and I decided that now’s the time to take another shot at it. My guess is that the issue stems from some rather high voltages. My bias voltage at idle is around -40V and with the tremolo engaged, can swing all the way to -60V. I’ve read all I can on several sites about the subject, but I’m afraid that I’m totally stumped. Here are some of the steps I’ve tried: -Adjusting the bias (all over the place) -Lowering coupling caps to .022uF -Adding grid stopper resistors (values all the way up to 100K) -Reducing grid leak resistors to 100K -Disconnecting NFB -Increasing the size of the bias cap -Changing tubes (including 5881s and various types of rectifier tubes) -Changing the Output Transformer (I found a post on the Hoffman forums where someone had a similar problem and it didn’t go away until he changed from a 6.6K primary to an 8K. It turned out my “6.6K” OT was actually only 6.1K. I swapped it for an actual 6.6K. But even using the 4 Ohm tap with an 8 Ohm speaker, thus bringing my impedance well over 8K, didn’t help). I can provide more details and voltage readings if requested. Any assistance would be greatly appreciated. I’m just hoping for some helpful suggestions that can get me going in the right direction, because I’m completely stumped. Is it possible that it’s not blocking distortion at all?