Re-Capping a Vintage Sony TR-1819 Six Transistor "Cube" AM Radio Made from 1968 to 1970

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@radiotec76 4 ай бұрын

Nice work! It looks like it just came out of the box. It’s good to see, what were considered cheap and disposable radios, so serviceable even fifty years after they were made and able to provide fifty more years of service.

@SeanBZA 4 ай бұрын

All 4 capacitors likely just degraded from 50 years of disuse. Apply rated voltage for 5 hours and test again and they might actually be a lot better, though yes the electrolyte has definitely leaked, but that old electrolyte, basically borax in water, is not going to be anything that causes issues. And yes they are not really good for high ripple, anything over 100mA they are unhappy.

@m80116 4 ай бұрын

Reforming. I believe it can be done if those little guys haven't leaked. Still I have some reserve on vintage Elnas... probably a very fine brand of capacitor, but one that I've noticed a recurring pattern of bad caps after a certain age.

@SeanBZA 4 ай бұрын

@@m80116 I tried with some Sangomo caps, and of the 6 I had that were NOS, the first reformed perfectly, almost zero leakage, and it sat at 5V ( given it is a 6V capacitor) for months on a shelf. The other 5 all though were rotten when opening the waxed paper protection, having rotted through the case under the plastic sleeving. Those were 1970's era ones, sitting in storage the entire time.

@m80116 4 ай бұрын

@@SeanBZA I thought paper wax caps were from the 50s and before.

@SeanBZA 4 ай бұрын

@@m80116 Not wax coated, but chassis mount can electrolytics, with an aluiminum housing in a clear PVC sleeve to provide isolation, and protected in storage with a waxed paper wrapper. Sort of like sandwich wrap, just one side plastic coated where it touched the capacitor, and the other side wax coated so it repelled water.

@bobbyk6585 4 ай бұрын

Totally the way I would have done the repairs.

@abcsd1254 4 ай бұрын

I seldom look at brands when I am on Mouser or Digikey buying capacitors. As someone who only does it for a hobby my assumption is whatever I get from them is going to be better than an open or leaking one I am replacing.