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How to test output transformers?

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JohnR

How to test output transformers?
« on: 8 Oct 2012, 11:33 pm »
I'm going to be selling a stack of OPTs from 50s/60s era amps. Since some are "pulls" from gear that wasn't working, I wonder how to test them. Is a resistance reading through and between all windings adequate? Or is it necessary to use a high voltage supply and ... and what?

 :scratch:
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SteveFord

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Re: How to test output transformers?
« Reply #1 on: 9 Oct 2012, 11:52 am »
AVNerdguy says shoot him an email and he'll walk you through it.
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JohnR

Re: How to test output transformers?
« Reply #2 on: 10 Oct 2012, 12:22 am »
Thanks  :scratch: 
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SteveFord

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Re: How to test output transformers?
« Reply #3 on: 10 Oct 2012, 12:25 am »
I'm just the messenger.  I guess he figured that would be the easiest way in case you had some unforeseen questions.
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Ericus Rex

Re: How to test output transformers?
« Reply #4 on: 10 Oct 2012, 12:16 pm »
IIRC, the Morgan Jones Valve amp book has a section regarding testing old trannies to determine specs.  Do you have that book?
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JohnR

Re: How to test output transformers?
« Reply #5 on: 10 Oct 2012, 12:43 pm »
Yes I do, and yes indeed there is a section. I will use a variac though instead of direct connection to the mains.

I may also try hooking them into an amp, as I have one I need to work on anyway.

Thanks  :thumb:
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