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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Tubes gone wild posted by Bud on February 26, 2007 at 11:28:04:
I will have to make an educated guess here so keep that in mind.A small signal tube is almost always cathode biased. This is done by inserting a resistor between the tube's cathode and ground. When the tube sees voltage on its plate current is drawn through this resistor which causes a voltage drop across said resistor. Because one end is soldered to ground the tube's cathode now is a few volts above gound but its grid is held at ground potential. This establishes a bias or static operating point.
If Tenor will tell you the tube needs to draw a certain current at a certain plate to cathode voltage anyone with the right tube tester can provide you with the right tube. You could also get this info from measuring your tube's operating conditions assuming it is still operating at proper spec. How to do so is circuit dependent and without a schematic I couldn't advise.
Russ
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Follow Ups
- You only need a bit more info - Russ57 16:19:53 02/26/07 (1)
- Thank you - Bud 16:39:12 03/01/07 (0)
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