09-18-2016, 01:52 PM
After doing a little looking around methinks your opt is bad. Should be about 550 ohms end to end not 3.1K. That's why there is such an imbalance between the plate voltage on the 45 tubes. I can't seem to locate a pin out for the spkr plug but the combination of any two pin should yield a resistance of 3.4K (field coil), or 275 ohms (ct to plate), or 550 ohms (end to end of the opt), or 3.9K (fc+1/2 of opt primary). Unplug spkr when measuring.
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Terry
