[Heathkit] DX-40 Pwr Xfmr

[john]

Whoops ... within 5% of a 120V nominal.. just right ABOVE the limit for a 
117 nominal, but I suspect that wasn't the failure driver.

You're gonna have to put you 6L6 back in line Bill!
john


t 07:14 PM 1/30/2012, john wrote:
>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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