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In Reply to: RE: Well that was quick....... posted by vinnie2 on October 11, 2014 at 13:20:19
The 845 plate curves show about -51 volts grid bias for a plate to cathode voltage of 430 and 62ma. (small red dot)There will be differences from tube to tube and the filament voltage will effect this as well.
If your filament voltage is low then the tube will not want to conduct as much and you will not need as much negative grid voltage (bias) to keep the plate current at 62ma.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 10/12/14Follow Ups:
I now get what you have when looking at the plate curves. I will be curious to see what I measure when the filament voltages are correct, but since the current and plate volts are good I will let it be whatever it is, as you and Jim and others have suggested.
Thanks!
It sounds like you pretty much got it all figured out now.
I'm happy for you.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
I had better take another look at my plate curves, because my dot ended up on the left side of the -50 line.
Thanks!
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