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In Reply to: RE: it is better than that...:) posted by PakProtector on February 28, 2015 at 04:49:55
Worse yet... if you run the filaments in series you also have 2 of those parallel plates at 5V less bias than the other two.
dave
Follow Ups:
one end of the cathode is biased at 10V from the other?
And the venerable RCA 10? Biased 7.5V different, one end of the cathode to the other?
And yet...
Did you know that simply running only the filament will melt solder?
Now, add the plate current to that.
I once built a good sounding S.E. amp out of one-- until I realized that a good 2A3 or 45 outperforms it. It made a nice transmitting tube-- I've replaced a lot of them in Mil.Spec. transmitters.
Guess what? Dull Cherry-Red is what the plates like. Run an old one at the same temperature, and you'll get nothing! (In a transmitter). They have to be "sharp".
For practical purposes, it's another outdated antique. Today, we have 100% solid-state transmitters with autotune.
---Dennis---
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