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In Reply to: RE: You might want to do a visual examination before you plug it in. posted by djn on April 11, 2020 at 20:31:38
It looks from the photo as if those resistors on pins 3 and 6 of all 16 different power tube sockets are soldered direct to untethered wires, on the resistor leads opposite to the tube pins. So you have uninsulated connections floating in air, 32 of them in fact. If any were to touch the chassis, you might have a disaster. I suggest mounting each of those free leads on a stand-off to stabilize them in space, to which you could then re-solder the wires that go to them. I hope I am making myself clear. OR it could just be an optical illusion I'm seeing.
Follow Ups:
Hi Lew, I was seeing the same thing today. I was inspecting all the solder joints and some of them look awfully close. I like your idea as I couldn't come up with one.
Just realized that in many cases, if not most, you can just de-solder, install a piece of heat shrink to cover the exposed joint, then re-solder and use the heat gun. No need to install so many stand-offs.
Hi Lew. Working in the shop today I found a can of Plastic Dip and wondered if I could just paint the bare joints with this stuff. I called the company and they said once dry it can stand temperatures of 200+ degrees then I called a shrink tube company and they said the same for shrink tube.
I think I will just paint the bare joints with Plastic Dip. Thoughts ?
Good idea. Those connections are on the cathodes, which could have high voltage though. I would think that Plasti-Dip would have a high enough insulation rating (certainly better than the current situation), but I wonder that if you shortened the resistor leads also, if they'd be more mechanically sound.
Cory
Good point Lew.
because there are so many loose ends there (32, if I count right), but the peace of mind will be worth it.
Better than fixing a fried amp.
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