You're overthinking the bias issue with regard to heat. I've had 400's upside down for extended periods of time (also on their sides) and Not had any problems. I would only worry about the BIAS voltage if it dips below -10V (toward ZERO). The reading you are looking for is the CURRENT FLOW THRU THE RESISTOR to be equal, REGARDLESS of what the voltage is (within a reasonable factor)(I use +/-5v total high to low) BUT NO CLOSER to ZERO VOLTS THAN -10VDC . Your EH's are tighter than a ticks ass in a fart contest.
411 x .0348 = 14.3028W per tube. Subtract 3ma for screen dissipation and you have 13.0698 Watts per tube. Bump them up to 36ma. That will give you 13.56watts per tube after screen dissipation which is just over 70% of Max dissipation. Your tubes will last a good long time.
You won't hear any difference. And if you DID do this, you'd need to use shielded cable to keep RF/IF interference out. Not a good idea. Find some .068's in there. They are the closest to .072uf IDEAL for 200-220K. And they are a stock size.
Larry,
All posted readings are with original Fisher tubes, not EH's that I got from Jim. V14 & V15 are 110 emissions and V16 & V17 tested at 120. Should I swap 14 & 16?
These tubes were drawing around 20ma with stock bias supply. Does it mean that with proper bias they are good enough that it wouldn't make sense to switch them over to EH's?