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SET Asylum Single Ended Triodes (SETs), the ultimate tube lovers dream. |
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SET Asylum Single Ended Triodes (SETs), the ultimate tube lovers dream. |
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In Reply to: Re: Put the voltage to good use posted by Gerado on February 1, 2007 at 15:22:11:
The first point is one where the selection of the power rating of the resistor is a problem, not necessarily the value. You can safely use a larger power rating without changing the circuit. Of course, you seem to have a higher B+ voltage than the circuit is designed for, which throws the entire circuit balance off, i.e. the 2a3 biasing is off, creating a situation where the 2A3 is conducting more than the circuit is designed for, and the higher current stressing the power resistors in the cathode.To bring it back into balance, you need to simultaneously raise the offset voltage on the cathode of the 2A3, and the voltage at the plate of the driver tube so that the voltage differential between the cathode of the 2A3 and the output of the driver is equal to the bias voltage needed for, say, 60mA through the 2A3. You do this by adjusting the voltage divider for the driver stage, as well as adding additional resistance to the cathode resistor of the 2A3. You will have to look at tube characteristics of both tubes and use a bit of Ohm's law to determine how to do this, which can be a daunting task for a beginner and any further assistance would require detailed information about the circuit you are working with.
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Follow Ups
- Re: Put the voltage to good use - David McGown 16:53:07 02/01/07 (1)
- Re: Put the voltage to good use - Gerado 22:32:43 02/01/07 (0)
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