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Old 16th Feb 2018, 10:06 pm   #10
FrankB
Heptode
 
Join Date: Oct 2005
Location: Olympia, Washington, USA.
Posts: 663
Default Re: National HRO PSU. Capacitor values.

A couple of things to keep in mind:
The PSU, if USA made, likely only used enough iron core to make it run acceptable hot here. When you drop to 50 Cy they xformer will get much hotter.
The other thing is that the line voltage here at the time was 110VAC. Likely you will have to reduce input voltage somewhat to compensate for the higher line voltages.
Many old radios I see here have fried the power transformers, mainly due to the higher line voltages, and the person who installs the wrong rectifier.
If you need a rectifier, just let me know. I may have a spare or 2. Yours for the postage.
I have not yet gotten around to restoring my HRO.
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