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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: 211 valve bias question posted by 2395 on July 6, 2015 at 20:05:20:
I would put test points for a volt meter in parallel with a 1r or 10r resistor in the cathode of the 211. You can put an amp meter in series with the cathode, but it will always be in the circuit and could be prone to failure.
One problem with the part of the schematic that you show is that the entire plate current for the 211 tube is going through the wiper of a pot. That will generate noise and hum and the pot is subject to failure. A far better solution would be to use a 50ohm 2W pot and parallel the two legs to the wiper with 10r or 15r resistors. Most of the current will go through the resistors and you will still have the hum nulling function.
You can determine the operating points for the 211 yourself using the Triode / Pentode Loadline Simulator.
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- RE: 211 valve bias question - Palustris 08:32:29 07/07/15 (0)
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