by Roy Mottram Tue Aug 02, 2011 1:59 pm
Peter,
you are correct! The two halfs of the circuit are identical and thus the voltages should be identical.
My guess is the tech who wrote the manual or took the voltages had tubes that were conducting slightly differently (internal resistance)
and so he just wrote down the actual voltages he had. Let's call it 225v +/- 10v, huh?!
Also, BTW, your other email question about bias, the 13.5v across 100 ohms common cathode resistor is 33.75ma per tube
(assuming they are all drawing exactly equal current).