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In Reply to: RE: d3a triode wiring posted by genelex on December 01, 2016 at 10:25:31
I guess I don't understand the question.
Pins 1 and 3 are both connected to the cathode.
The cathode normally goes to ground (through a resistor it you are cathode biasing the tube).
No real chance of causing oscillation.
Just use whichever one you want and leave the other one alone.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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So its best to leave one of the cathode pins unconnected ?
It depends if you use capacitors to shunt the cathode to signal common at HF (recommended), in which case it gives flexibility of connection with respect to size/fit form and function.I agree with the M.Jones reference about triode connection D3a with extra grids to plate and not to cathode.
I use D3a in low noise application - and it is a tricky tube.. but worth it.
Shane.
Edits: 12/01/16
I don't see why not.
It's already connected to the cathode and the cathode will be connected to ground (or the cathode resistor to ground).
It's not like a high gm tube with a grid connected to two pins.
A high gm tube with a grid connected to two pins, both pins need grid stop resistors or problems can happen.
I don't see how a tube with two cathode pins will cause problems.
Maybe someone else will chime in with more info.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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