The Amp Garage

Does the 1.25v dropped over the heater factor into the bias (ie. if grid is at -6v and pin 3 is at 1.25v referenced to pin 5/ground, do you add these together for the effective bias? Instead of relying on grid leak, could I slap a zener or negative linear reg off the inverted output (assuming I set...

Howdy, While I've got a -decent- general understanding of tube theory, I am struggling to wrap my head around dealing with direct heated pentodes. Cliffs: I've got a couple of amps based around the Murder One which took a bit of work to get going - to cut a long story short, the bias circuit (using ...