[Johnson] Transformer "cooking" by Rich Measures

[Eddy Swynar]

On 2014-01-06, at 11:55 AM, Brian Burns wrote:

> Hello David,
> 
> ~ Rich Measures put out some information on how he dries out old power
> transformers by applying AC with a variac.  It's probably in the
> ham_amplifiers archives some where or maybe on his web site.
> 
> Do you have a link to Rich's website, or have his email? For boatanchor
> restorers it would sure be convenient to be able to leave a transformer in
> place, unless it needed to be removed for some other reason. I've got a
> bunch of them coming up (;->)...
> 
> Thanks,
> 
> Brian
> 



Hi Brian,

Some years ago I had occasion to correspond with an engineer at the Hammond Mfg. Co., in Guelph, Ontario, on the matter of ensuring that ALL moisture was OUT of an open-framed transformer BEFORE the application of any working voltage...

As I recall, he recommended "baking" the transformer in an ordinary convection oven at some 250-degrees F for about 2 - 3 hours, or so, to ensure that all water / dampness had escaped the unit...

The only downside to this methodology would be one's XYL, Hi Hi. For some reason, wives simply do not, or CAN not, "...get it"!

~73~ de Eddy VE3CUI - VE3XZ