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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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Audio Amplifier Distortion Tracing
Hi all,
I'm using an old (1960 I guess) Advance AF generator (15hz-50khz) in an attempt to discover what kind of distortion my Technics hifi amplifier is producing so I can fix it. However, for some reason I'm getting terrible self-oscillation from the otherwise stable (though not-very-nice-sounding) amp that can't be stopped once it starts. I'm just wondering if I should be using some sort of buffer between the generator and the amp input? At the moment I'm just feeing it direct. It's the only cause I can think of. I've checked the generator by itself on a suitable scope and it's absolutely rock solid right across the range and the attenuators are fine so it can't be the gennie itself; must be something I'm doing wrong. What doesn't help much is the gennie doesn't state what its output impedance is. Not sure if that's relevant or not, though. Any suggestions? cheers, cd |
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