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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Valve amplifier loosing 'gain' over 20 minutes
A friend has a 1950's Tannoy PA valve amplifier which works when first
turned on but the output steadily drops to zero after 20 minutes. That's his description of the fault. I have not tested the amp yet. Thinking about it, I'm assuming it is a problem with a capacitor. I'm not familiar with all the failure modes of old capacitors. I know that old electrolytics loose capacitance and become leaky when the dielectric degrades. Could this fault be caused by a leaky interstage capacitor which is affecting the bias of the next valve stage? Or could it be a valve problem? |
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