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Well, I replaced all the tantalum caps. Then I swapped out the transistors, ceramic caps, and the op-amps to no great effect, so I put the old components back. Looking at the schematic I found below, I decided to try some changes. I added a 100pF cap across R13. This smoothed out the noise...

I measured all the tantalum caps and only one of six was still in spec. One of the 10uF caps was over 18uF. Looks like I'll re-cap it and see if it helps.

Doesn't have any electrolytic caps. They're all tantalum and ceramic. Not sure what tants do when they get old... I guess I could just recap the whole thing.

I made an audio probe, but the darn thing pops and scares the hell out of me every time I touch a circuit. I mean it's only a capacitor in series, no idea how I messed it up. I've tried several cap values, but nothing works. I'm afraid I'm going to break the speaker I'm using to listen with...

Hello, I recently purchased a 1978 M-106 Noise Gate Line Driver. I found that the DC jack was shorted to the case and it had a bad protection diode (also shorting V+ to GND). I fixed both issues and restored the pedal to very good condition and it works now, mostly... As the pedal is clamping...