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Tech Square Technical and speculative discussion of amps, cables and other topics. |
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Tech Square Technical and speculative discussion of amps, cables and other topics. |
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In Reply to: Since it is 60Hz hum not 120Hz ... posted by clifff on March 21, 2005 at 14:54:58:
Thanks a lot!A friend of mine that has the scope may be able to help me through this. Your tips should be the keys to unlocking the mystery. All things considered, the ambient noise in my house always covers the hum, but it's one of those things that knowing it exists is a source of minor annoyance. The unfortunate side of trying to trace the possible faulty ground is the physical construction of the unit. I'm afraid that major disemboweling may be neccesary just to get at points to test, and the bloody thing is packed quite full. Even changing dial lamps required waaaaay more disassembly than I had expected, and that was only loosening/removing the bare minimum to be able to get in with forceps to grab the lamps. Lots of cursing when one would drop and fall onto a board out of sight. LOL, at around 50lbs its not exactly something I could shake to get them out!
Anyhow, for what its worth, I have full schemata and a block diagram to work with. If describing the paths on the block diagram might give you some ideas, here goes:
Input>
Selector switch>
Tape outs, Mode Switch (for Quad functions), Dolby switch (& Signal stength/Dolby meter)>
Buffer amp>
Remote/Local switch> (for wired remote)
Balance control / Volume controlThe Dolby and Mode functions are not used, so I would assume when not in use they are not in the circuit. Hum does not change when either are used.
Does this help you with any other ideas?
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Follow Ups
- Re: Since it is 60Hz hum not 120Hz ... - firestop41 10:33:56 03/23/05 (0)
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