[Hallicrafters] The hot SX28 6V6s

[Carl]

All operating and repair benches here are fed with large bucking 
transformers that limit the AC to 110-115V.
A cheap oddball voltage 10A transformer is good for about 1200W for 
instance.

The variacs are used for initial testing and on the big AM amps.

Carl
KM1H

----- Original Message ----- 
From: <WA1KBQ at aol.com>
To: <laffitte at prtc.net>; <hallicrafters at mailman.qth.net>
Sent: Monday, October 31, 2011 10:36 PM
Subject: Re: [Hallicrafters] The hot SX28 6V6s


>I don't run anything here without a variac. Stuff is on all day long and
> nice to find transformer is not much more than warm at the end of the day. 
> If
> I  have not checked to see what setting produces correct filament voltage
> in a  particular unit I just go with 110 until I get around to it.
>
> Regards, Greg
>
>
> In a message dated 10/31/2011 9:55:08 P.M. Eastern Daylight Time,
> laffitte at prtc.net writes:
>
> The heat  problem in the 6V6s of my SX28 was basically solved by lowering
> the AC voltage  to 110. Household voltage here sometimes soars to 125VAC.
> Lowering the voltage  with a Variac reduced the heat to what one could 
> consider
> warm and   normal. It was hot to the point where one could not touch the
> lid just above  the tubes.  The tubes still have some bluish glow left 
> though.
> This tells  a lot about the importance of operating these older rigs at 
> the
> voltage for  which they were designed. Anyone remembers when the voltages
> came  up?
>
> 73s
>
> Guido  KP4FAR
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