[Heathkit] DX-40 Pwr Xfmr

[john]

Hi Bill and Gary

That 125 V is within 5% of a nominal 117, so I doubt that's the reason, 
since that's a typical line voltage tolerance... I'd guess 55 years of 
aging might be more of a factor.  :-)   Are the caps ok?

John your neighbor to the north  K5MO



At 06:49 PM 1/30/2012, Gary wrote:
>Hi Bill:    With a line voltage of 125 volts. That pretty much says why the
>transformer failed.
>Regards,
>Gary
>----- Original Message -----
>From: "Bill Stewart" <cwopr at embarqmail.com>
>To: "heathkit" <heathkit at mailman.qth.net>
>Sent: Monday, January 30, 2012 6:32 PM
>Subject: Re: [Heathkit] DX-40 Pwr Xfmr
>
>
> > The verdict is in...its shorted. I took it out and put 60vac on it and its
> > now nice and toasty. Looks like a trip up north for the ole tranny.
> >
> > One question: those who have had transformers re-wound, do you have them
> > re-wound to today's line voltages? or keep 'em to the old spec...mine L/V
> > is in the 125v range.
> > Tnx for all the suggestions...73 de Bill K4JYS
> >
> > ----- Original Message -----
> > From: "Bill Stewart" <cwopr at embarqmail.com>
> > To: "heathkit" <heathkit at mailman.qth.net>
> > Sent: Monday, January 30, 2012 2:55:09 PM
> > Subject: [Heathkit] DX-40 Pwr Xfmr
> >
> >
> >
> >
> >
> > Good afternoon:
> >
> > My trusted DX-40 is blowing its fuse. After some initial checks, I have
> > disconnected the HV leads and made the following measurements: Total HV
> > winding resistance: 312 ohms
> >
> > Outside-to-ct: 181ohms/344 vac....
> >
> > Outside-to-ct: 131 ohms/274 vac. The ac measurements are made with 60vac
> > at the plug.
> >
> > The xfmr gets warm even tho the on time is short.
> >
> >
> >
> > Would ya say this resistance/ac voltage imbalance would indicate a tranny
> > problem?
> >
> > Thanks, 73 de Bill K4JYS
> >
> >
> >
> >
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