[Heathkit] DX-40 Pwr Xfmr

[Glen Zook]

The DX-40 power transformers failed quite often with a line voltage of 110 VAC!  Heath just ran the transformers "on the ragged edge" and quite a number failed after just a few weeks.  The power transformer in the DX-35 was even worse!  It was definitely overloaded.
 
Glen, K9STH Website:  http://k9sth.com


________________________________
 From: Gary <xfrmrs at roadrunner.com>
To: Bill Stewart <cwopr at embarqmail.com>; heathkit <heathkit at mailman.qth.net> 
Sent: Monday, January 30, 2012 5:49 PM
Subject: Re: [Heathkit] DX-40 Pwr Xfmr
 
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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