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quote "I used one for years that was just a real quick and dirty "need this now" affair. Took an extension cord, cut one side of it and placed a ceramic lamp socket in series with the cut side. Only within the past week did I finally mount it on a piece of wood." end Quote. That is the exact...

Did you check the speaker relay, can easily be the cause..

Chip Quik - ChipQuik Alloy (10)

For times like this, I found "Chip Quick" to be a life saver, it's a low temperature solder and flux to go with it. made for surface mount components, but work great with through the hole parts too. Amazing stuff..

What model Yamaha is it?

Would be great to add this between the receiver and the amp. https://reverb.com/item/44117372-dbx-subharmonic-synth-120-synthesizer

Many times i have found the disc spindle motor to be problematic, sometimes oiling thre bearings help but not always.

You know that just below the oscilloscope screen are two test points, put there for calibration, .2 volt and 2 volt square wave. You just connect the scope probe to either one,. its usually for calibrating the scope probe.

Thats old hat, been using bees wax on dial string for over thirty years now.

Amazing how similar that is to an Audio Research Preamp.

How about this.. https://www.parts-express.com/round-speaker-terminal-cup-2-15-16-gold-binding-post-banana-jack--260-283']https://www.parts-express.com/round-speaker-terminal-cup-2-15-16-gold-binding-post-banana-jack--260-283

Yes i have seen that so much with the Duracell Batteries, even when not used and in storage. not so much with Eveready Batteries cells, though i did see a few leak..

Had pliers similar to this , worked great for 30 years.

I did not see, Jethro Tull "A Classic Case" album.

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Every time i had problems with my Weller irons, it always turned out to be a bad wiring connection between the iron and the base, usually at the connection to the base. a few times i just had to replace the iron with the wiring itself, as they fail at times.

Would be nice to see the back of this rack system..

If you can find one of these Heathkit AD-1307 units, they are pretty good.

That looks to be a Pioneer lens mechanism ass'y that reads and plays the disc upsidedown in their six disc changers. I have seen this many times at work, and nine out of ten times that I reset the lens and use the smallest touch of glue, the unit worked fine for me. Also a couple of times I had...

I go with possibly a bad power switch, arcing till contact is fully made.

Most likely your power switch is going bad, has initial arcing when turning the unit on.

there was this meter from Heathkit..

The cam motor shaft, also can have dried grease on it. I would check that first. if so you would have to remove it to properly clean out the dried grease then relube with lithium grease.

You may want something like this, a PAL to F adaptor, which used to be packed with many of these Yamahas...

On those soldered in wire headers, many times (but not always) I find if I follow the wiring harness to its other end. That is where the detachable plug ass'y is.