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In Reply to: RE: Running Power Transformer 'unloaded' posted by rogerh113 on August 24, 2015 at 16:58:13
Generally speaking you should be OK to run a power supply unloaded for measuring etc. for a little while.
Try to minimize breadboard operation for safeties sake. 1 1/2 our seems excessive.
Is this a vintage/antique transformer?
If the transformer is new, it should measure fairly predictable, albeit a little high when unloaded with the intended voltage on the primary.
If you want to test different power supply configurations, you might try a power resistor as a pseudo amplifier stage load.
PSUDII is also an invaluable tool for basic power supply rendering if you aren't already using it.
Quick simulations can save days of bench experimenting, which also minimizes exposure to high voltage testing situations.
Have fun
Infamous sockpuppet
Follow Ups:
Thanks for the input. It sounds like I should build up the entire amp and then bring it up slowly with the Variac and do the checking I want to do. I will have some NOS caps in the amp, and wanted to bring them up slowly so that if any reforming is necessary it will happen. Just thought I might be able to split the workload and get the power side of things shaken out first.
Regards -- Roger
I think what gargoyle meant is that with all the great caps avaialble these days there really is no need to take a chance on old caps. Use high quality new ones and get years of trouble free enjoyment. Lots of info on cap types and their sounds on the web.
By all means carry on as you were.
Bringing up old caps slowly might not be a bad idea.
I would bother with any older electrolytic capacitors though.
Infamous sockpuppet
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