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Old 5th September 2010, 11:15 PM   #11
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there are a few possibilities here:
1) however unlikely, the preamp somehow damaged the input stage of the amp (both channels with the same failure at the same time is very unlikely, but possible.
2) an outside source of the behavior of both the preamp and the amp, such as an RF source. this is something that should be investigated.
3)something in the power supply of the amp causing the noise. amps of that vintage used transistor regulators with a zener reference. one source of noise here is the bypass cap for the zener drying out, and the regulator transistor amplifying and passing the avalanche noise along to the regulated supply.
4) the diff amp transistors, being 30 years old are beginning to show signs of aging, which in early stages shows up as noise.
5)catastrophe theory. the noise was always there, and the OP never noticed it before another failure (the bad behavior of the preamp) called his attention to it. this still doesn't rule out number 2, 3, or 4
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