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In Reply to: RE: WHOA! 304Tls posted by Michael Samra on February 25, 2015 at 22:02:43
304TL is an interesting tube. It has four plates in parallel. Supposedly, it is four 100TL's in one envelope. And the filaments are divided into circuits, so you can run them at 5V/25A or 10V/12.5A.
There's also a 304TH, same but with a MU of 20.
Follow Ups:
two 152tl in parallel.
Link below:
it is proof that the Religious Fanatic prohibitions against paralleling tubes is BS!
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
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
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For practical purposes, it's another outdated antique.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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