![]() With a pair of 6V6s fixed bias in push-pull you want to be aiming somewhere between 10W plate dissipation per tube (9.8W for a safe long-tube-life-boring tone - 11W for a sexy tone - Do I hear 12W? -). This is because alot of things can add up to influencing the bias level, not just the -ve voltage feed at the output tube grids. This is more critical than just assuming that the -31V will be supplying the appropriate bias for the output tubes. The other thing to check is the output tube plate dissipation. Glad you like it BTW - it looks like a very tidy job - very nice This will pick up the 4 Ohm tap (because the 4 Ohm is just a tap off the 8 Ohm winding) - albeit that the NFB will have a tad more resistance from the extra 4 Ohms in that 8 Ohm winding that the NFB passes through when the 4 Ohm tap is utilised. I unhooked one jack and WOOHOO! Nice sound and pretty loud, too!!Yep you only need the one NFB off the highest value (8 Ohm) tap. ![]() having two speaker jacks (4 ohm and 8 ohm) and having the negative feedback loop hooked up to both might be messing me up.
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