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24.20.105.115
Yes, I know 6060, this is a POS compared to Astron, but would still like it to work. The trans. is a RCA SK3858. Put a 2-3 A load on it, still too high at 15.5V. Tha transformer is 17VAC no load. Can I change a part value to get it to 13-14 output DC?. Don't know if the SK is OEM, have no history on this. Blue cap. is 7500mf.
Follow Ups:
Are you wanting to restore this to its original, working configuration, like some museum piece?
Do you need the 6 amp potential for the application you're going to use it for?
If the answer to both questions are "no", then I'd suggest disconnecting the T0-3 transistor, which seems to be defective, as gusser pointed out.
Depending on your amperage and ripple reduction requirements, the T0-3 could be replaced with a TO-220 type regulator, mounted on the same heatsink the TO-3 is mounted to.
Something simple, like a 7812 will give you up to one amp of current with a marginal reduction in ripple. Or, if your application is something critical, like a phono stage or DAC, you could install a Belleson Superpower regulator which would supply up to 3 amps with very low noise and a large amount of ripple reduction. There's also some good choices in between those two examples.
Without knowing what your intent is, it's difficult for anyone to give you accurate suggestions.
Just to power a mobile rig on the bench, HAM radio or GMRS type thing.
I may well just get 220 reg. like you said. I don't want to use a switching supply due to RF noise.
As long as the regulator amperage rating exceeds the current demand of whatever you're powering, you should be good. I'd replace the electrolytic cap too, depending on how old it is.
Yes, well only 6A, but I can use a low power transmit setting until i get a proper supply.
I think the regulator is looking like an output transistor. Three terminal TO-3 12 volt 3 amp regulators are available. I think yours is blown.
I do not think the SK transistor came with the power supply as it has no electronic regulator board.
I'm sure it's the original part.
You don't need an electronic regulator board to have a regulated power supply. :)
That glass diode is a zener....there's a resistor from collector to base, the pass transistor, and the filter electrolytic.
This is as simple as it gets.
It's a first-year electronics project for many many many many years. There were millions of power supplies like this made.
Dave.
Sounds right, what do you think is wrong?. I'll start checking the diode and transitor. resistor "looks" fine, but I know better.
And not a regulator as such. I'd expect voltage regulation to be similar to that of the transformer /rectifier/capacitor combo alone but with lower ripple.
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