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Pioneer SX-1000TD

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MacGeek:
A couple of suggestions-looking for easy stuff.  Check and tighten all screws.  Take the eraser end of a pencil and try gently pushing on and flexing the boards, while listening for changes in noise/hum, etc.  Be careful as this requires the unit to be on.  This may expose a cold/loose solder joint or a crack in the boards.  If you hear changes a strong magnifying glass may help to locate the problem.  While the unit is off, unplug and reconnect any internal jumpers; remove and reinsert fuses.

Basically move everything that can be moved in an effort to identify anything weird or that changes.

scorpio333:
Thanks MacGeek, great tips, especially the pencil eraser. I like learning as much as I can about this stuff. Lots of great old stuff out there that is deserving of continued use. Since I don't have a lot of the basic electronics training I've been trying to go through some online training.

I tried one more thing. These old Pioneers have a voltage selector on the rear. 110, 117, 130, up to 230 I believe. I tried the first three, when I tried the 130 things settled down a great deal. Phono has a bit of ground hum up about 75% volume, which is way too loud to listen to at that level. AUX is almost dead silent, slight white noise over 50%. Tape is noisy as all hell at any volume, but no plans for tape listening anyhow. We'll see how it reacts to getting more use, but for now it's a rocking little unit.

MacGeek:
I have no formal electronics training and know only what I picked up along the way.

It seems odd that any one high level input is noisier than another, they all pass through the selector switch.  Or, does this unit not have tape inputs on the input selector, rather having it/them via monitor button(s).  If it has buttons, try cleaning and exercising them again.

If the phono doesn't hum until the volume control is past the 2:00 position, I think you are doing fine

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