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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: Help with Cary SixPac Coupling Capacitors Replacement / Upgrade posted by rclanger on July 13, 2014 at 07:20:31:
Tube testers test tubes at a single voltage and bias level, which is most likely different than how the tubes are used in your amplifier. And when the tube is tested, after it warms up, the tube is only tested for a few seconds. I'm not suggesting to not test tubes, but for the problem you described, the best test is to swap the tubes from one channel to the other, and see if the problem follows the tubes.
A common design mistake made with tube amplifiers with solid state rectifiers is that the capacitor voltage ratings are selected at some percentage above static voltage. During the first 5 or 10 seconds, before the tubes start to conduct, the B+ is higher. This is the voltage that should be used, not the lower B+ when the tubes are conducting. One simple solution is a thermistor to the power transformer primary.
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- RE: Help with Cary SixPac Coupling Capacitors Replacement / Upgrade - fredtr 09:16:54 07/13/14 (0)
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