[Heathkit] DX-40 Pwr Xfmr

[Bill Stewart]

In 1959, my novice tx was a DX-40. When I upgraded to cond., I traded it to a very good friend. One afternoon he came home from school, went into his bedroom/shack and turned it on to 'warm' up, then went to eat super. When he returned, his room was full of smoke...and that was in the days of 117vac. His dad banished him to the back yard smoke house. He said he didn't mind that too bad, cause he could sneak a few cigs. We are still good friends. I expect today's higher line voltage attributed to my problem...thankfully I had added a fuse.
73, Bill K4JYS

----- Original Message -----
From: "Gary" <xfrmrs at roadrunner.com>
To: "Bill Stewart" <cwopr at embarqmail.com>, "heathkit" <heathkit at mailman.qth.net>
Sent: Monday, January 30, 2012 6:49:09 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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