AC Line Voltages, Then and Now

[Dave Edwards]

Try using it on a variac at 110, and see if it runs significantly cooler.
...Dave
----- Original Message ----- 
From: <digital-conjurers at ADELPHIA.NET>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Tuesday, May 09, 2006 2:02 AM
Subject: AC Line Voltages, Then and Now


>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
>
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