Quote:
Originally Posted by Electronic M
The selenium bridged is a bad but common practice.
Personally I see nothing wrong with that lytic. I only stock 2 voltages of lytic 160V and 450V (except occasional cases where 200V in a capacitance value happens to be cheaper than 160V) and anything over 160V just about always gets replaced with 450V (except odd cases like 250uF 200V doubler caps where I don't stock something that will work and have to order a part).
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it's proving to be quite fun indeed.
the old grey Nichicon cap was leaky, the 80uf they had in there, after removing the selenium stack, i put power to it through a 15 ohm 2 watt resistor, and the resistor fried., so that cap has been tossed an new caps put in, and replaced most papers.
this is where the real fun started.
As I still do not know what to replace that 22 ohm main line resistor with ( where the fool had the 3 ohm) I put in a 30 for now, till I can work out what it needs, turned on to watch the fireworks!
tubes lit up, no sound but a faint hum.
https://i.imgur.com/s9aDDXz.jpg
b+ was about 165v
started to smell something HOT!
IR camera said that r28 is very VERY hot.
b+ goes to the center tap of the audio x-fomer and is fed to that resistor, SHOULD be 100v/90v depending on AM/FM, it was 35v, not good!
shut down, pulled audio output tube, there was now 165v on both sides of r28, plugged it back in with it on, instant drop to 35v.
AUDIO OUTPUT BAD!
The fool blew it up by over biasing it...
