AC Line Voltages, Then and Now

[Bob And Bettina Groh]

Two comments:
1.   I would check the power supply capacitors for dc leakage. They 
start to get leaky (aka 'lossy') at their end of life and that will 
increase the current draw on the transformer.
2.   If you do need or want to drop the line voltage, a series 'bucking' 
transformer is the best way to go.

73 de WA2CKY
Bob Groh

digital-conjurers at ADELPHIA.NET wrote:

>I recently became a bit concerned that my TX-1 Apache's power transformer seemed to be running a bit hot: 47-49 degrees C.  Generally, I don't like to see anything but tubes get hotter than 50 C, so this is pretty close to the line.  The modulation transfomer runs a bit toasty at 45-47 C, but the plate transformer runs cooler at about 38C.
>
>I notice also that the plate voltages are around 800VDC, instead of the specified 750.
>
>As the older rigs were designed for 115 VAC, and we get about 123 VAC coming out of the wall here (SDG&E just loves to push as much voltage as they can through the lines), it's a fair chance the higher AC input might be responsible.  I was wondering if:
>
>1. 47-49 C isn't too hot
>2. Could a "step-down" (there are many designs) to 115 VAC cool things off?
>
>...and, in the long run, is it worth it?
>
>Thanks to the group in advance,
>
>Lin/KJ6EF
>
>-----------------------------------------------------------
>Products bought, sold or traded here is the responsibility of the
>parties involved.  This list and the City of Tempe are not responsible
>for losses or misrepresentations of any kind.  Buyer beware!
>
>-----------------------------------------------------------
>This list is a public service of the City of Tempe, Arizona
>-----------------------------------------------------------
>
>Subscription control - http://www.tempe.gov/lists/control.asp?list=HEATH
>To post - HEATH at LISTSERV.TEMPE.GOV
>Archives - http://listserv.tempe.gov/archives/HEATH.html
>
>
>  
>

-----------------------------------------------------------
Products bought, sold or traded here is the responsibility of the
parties involved.  This list and the City of Tempe are not responsible
for losses or misrepresentations of any kind.  Buyer beware!

-----------------------------------------------------------
This list is a public service of the City of Tempe, Arizona
-----------------------------------------------------------

Subscription control - http://www.tempe.gov/lists/control.asp?list=HEATH
To post - HEATH at LISTSERV.TEMPE.GOV
Archives - http://listserv.tempe.gov/archives/HEATH.html