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Re: SS Amplifier performance change over years

Here's one change I've observed: the accumulation of dust/dirt/salts from the environment can lead to small leakage currents. This can cause problems at high-impedence/high gain points in the circuit. I've had a phono preamplifier (of my design) develop DC offsets, and the muting circuit in a cassette deck fail due to leakage. In both cases, the problem took 10-20 years to develop.
Ed




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