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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: Re: Plate dissipation & tube rolling posted by Ganesh on January 23, 2006 at 12:15:14:
Knowing only what the voltage reading is should not be an impediment to discovering what the idling current should be. I do not know your amp, but I would be willing to bet that for each channel pins 8 of the output tubes' sockets are joined together and a 1 ohm resistor is connected to chassis ground from both pins 8. Alternatively, pins 8 of both output tubes' sockets are joined together and a single 0.5 ohm resistor is connected to chassis ground. Either arrangement puts the cathode of both output tubes at 0.5 ohm above ground. Then when measuring voltage from either socket, the voltage reading enables you to translate directly to current. For instance, a reading of 40mV across 0.5ohms equals 80 mA. But the 80mA of current is split between both output tubes, so that the nominal idling current for one tube is 40mA. Now it may be that the resistors connected to the chassis from pin 8 may be a different value, but the process of establishing the idling current from a voltage reading is the same. It's just the voltage divided by the resistance equals the current.
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- Re: Plate dissipation & tube rolling - corerosin 10:24:51 01/24/06 (0)
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