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I have a Marantz 2275 that has recently started to have a static "whitenoise" like sound for about the first two minutes after power on, even when the volume is all the way down. I'm thinking the filter caps might be going bad.
Any clues, hints, help greatly appreciated.
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I think I've isolated the problem to the preamp section. When I turn it on with the tone controls out (defeated) I don't get the noise.
It's in both channels, although the left is a little louder than the right.
It's a beautiful old receiver that sounds great once it's warmed up - I hope I can get this figured out. Thinking I might just get a schematic or service manual with a parts list and rebuild the board with new components and fresh solder joints.
If you need the SM, PM me.
Sounds like a transistor on the power supply of the tone preamp board.
The 2275 is a really nice piece of audio. BUt it IS due for restoring - professionally.
charles
My money is on a transistor going south as Ralph pointed out or a cold solder joint. It's roughly 40yrs old!
My bet is on a noisy transistor at the input of the power amplifier section. I suspect only one channel is making the noise- am I right?
This is a problem I have seen before in the 2275.
Does it change with moving any of the controls before it fads out?
I'm thinking a bad cap as well. But a filter cap usually hums.
Jiggle ALL the controls. See if you can reproduce the effect after warm up. Post your results. Also go over to the vintage forum and post this. Great bunch for of guys for this kind of stuff!!!!!
charles
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