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Vintage Asylum Classic gear from yesteryear; vintage audio standing the test of time. |
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In Reply to: Fisher X-200 Bias Question posted by DHJ on December 30, 2003 at 08:37:13:
with regards to bias, I like to calculate the actual current flowing through the output tubes rather than relying on the bias voltage. As the tubes age the bias voltage will have to be adjusted to maintain the correct current flow through the tubes. Is there a cathode resistor on the output tubes? If so then you can measure the voltage on the cathode and calculate the current (should be around 40 mA per tube). Also 457 volts on the plates may be a tad high? If so you might consider putting a thermistor in each leg of the primary windings of the power supply transformer to get it down to speck (if indeed it's off a bit). After following this forum for a while now it seems most people do replace the filter caps as a precautionary measure so it's probably prudent to do so. Good luck!Bill
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- Re: Fisher X-200 Bias Question - microbe 10:20:21 12/30/03 (0)
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