[R-390] RE: Power transformer failure

[Steve Hobensack]

 I have said this before, and I think it is worth reminding again. I have had two power transformer failures. The fix is not too difficult, so don't trash the transformer until you check out the little hi-tension feed-through ceramic tubes in the transformer. The failure was just inside transformer in the tar potting at the entrance to the tube.
...Steve...N8YE


> ------------------------------
>
> Message: 5
> Date: Sat, 22 Mar 2008 15:15:52 -0400
> From: Bob Camp 
> Subject: Re: [R-390] [Fwd: Reconditioned Amelco R-390A Part Failure]
> To: Tom Frobase 
> Cc: R-390 at mailman.qth.net
> Message-ID: 
> Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
>
> Hi
>
> Magnetics do indeed fail just as you describe. It's not uncommon in
> older gear. My guess is that eventually we will start to see power
> transformers fail in the same mode.
>
> Hi folks,
> We've been seeing that sort of thing in SP-600 chokes. They're big,
> heavy, potted, but some do short to the case. Some folks, living
> dangerously, have just mounted them up on insulators (I hope they insulated
> the case from fingers). The potted pwr xfmrs have been pretty reliable.
> Audio xfmrs have gone, but usually due to leaving the secondary open when
> using fones or external amp, etc.
> 73,
> Al, W8UT

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