This is my second go around on rebuilding this amp. I am starting with the power supply where I think the issue is and need advice on trouble shooting.
I hooked up the 54-150 transformer to 115V and are getting 115V and 6.3V AC off of it, which I think is correct. When I hook it up to the full wave voltage doubler and test the voltage on the first section of the four section can capacitor I get 333V DC. I think this should be 230V DC.
I used an ESR meter, which I think works, and the 30 uF capacitors test okay and I tested the diodes and they are okay too. The four section can capacitor also tested okay on the ESR meter.
I attached a picture of what it looks like, info on the transformer, and info on the power supply (pg 5). I also have a copy of the original manual.
Any advice would be appreciated.
Thanks!
Jim
I hooked up the 54-150 transformer to 115V and are getting 115V and 6.3V AC off of it, which I think is correct. When I hook it up to the full wave voltage doubler and test the voltage on the first section of the four section can capacitor I get 333V DC. I think this should be 230V DC.
I used an ESR meter, which I think works, and the 30 uF capacitors test okay and I tested the diodes and they are okay too. The four section can capacitor also tested okay on the ESR meter.
I attached a picture of what it looks like, info on the transformer, and info on the power supply (pg 5). I also have a copy of the original manual.
Any advice would be appreciated.
Thanks!
Jim
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Voltage doublers double the peak voltage, more or less. So 115 volts RMS x 1.4 = peak x 2 = 322 volts. You're good!
Cheers, Steve
Cheers, Steve
Why 230V?
The plan clearly shows 290V of DC.
We expect ~~10% sag under full load on a basic supply. Doublers tend to sag more. 13% sag (333V to 290V) is right in the zone.
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