Quote from: g1 on March 04, 2023, 06:35:33 PMQuote from: Luthier Vandros on March 04, 2023, 12:31:48 PMonce the new silicon is in, I'll try to align voltages between green and red, along with biasing these little jerks.On another forum J202 fet was working as a drop-in replacement for the 2N5485/TIS58 with no adjustment required.
TY, G1. I found a broken trace under the board. The 3819's are passing signal, but cery attenuated compared to the green channel. I imagine I'll have to tweak the drain resistors. Is there a rule of thumb? I have a solid 24v on the source rail (thanks to a 24v zener. More on that below.
Btw the schematic posted must be of a more recent model. My circuit board has several variances, such as no 24v zener off the E supply. Instead that tap is supplying 34v. Both the cap and dropping resistor have been replaced, so as a test, I tacked in a 24v zener.