53-658 selenium rectifier replacement questions - Printable Version
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53-658 selenium rectifier replacement questions - WyTex - 08-07-2019
Hi guys -
Picked up a clean 53-658 a few weeks and started on it yesterday. It's all original and clean under the chassis.
http://www.nostalgiaair.org/Resources/download.asp?FN=\M0013774.pdf
It does not power up on AC and does not register any volts on my amp meter. Tubes test good. Am I correct that the likely culprit is the selenium rectifier? I haven't replaced one of these yet and could use some guidance.
This article suggest installing a terminal strip with 1N4004 diode and resistor between 20 and 200 ohms. Outside of starting with a 100 ohm resistor and repeatedly measuring, is there a known resistor value I should use?
http://www.w3hwj.com/index_files/RBSelenium2.pdf
Thanks,
Paul
RE: 53-658 selenium rectifier replacement questions - Radioroslyn - 08-07-2019
Measure the AC voltage from the anode of the selenium to the - side of the filter caps (B-) should see 120vac or so. If not check the off on switch. If that checks out then measure the DC voltage from the cathode of the selenium to B-. Should see abt 100vdc. If not then the selenium is bad.
Gezz that an awful schematic.
RE: 53-658 selenium rectifier replacement questions - WyTex - 08-08-2019
Thanks Terry. Appreciate your help.
Yes, the schematic is tough on the eyes, even printed on 11x17. Photofact is on it's way.
Paul
RE: 53-658 selenium rectifier replacement questions - David - 08-08-2019
Beitmans
RE: 53-658 selenium rectifier replacement questions - Radioroslyn - 08-08-2019
Tnx David,
Both Riders I looked up were pretty poor. Forgot abt Beitmans.
RE: 53-658 selenium rectifier replacement questions - WyTex - 09-04-2019
There were a few discrepancies between the schematics but the culprit was the a bad volume pot.
Paul