[Hallicrafters] The hot SX28 6V6s

[Warren Elly]

AC line voltage is especially critical with transmitters like ef johnson rangers - most were wound for 110 volts
The variac is the AMers friend

73
Warren W1GUD

On Oct 31, 2011, at 10:31 PM, "Asif Khan'Nick'" <hallicraftersx28 at aol.com> wrote:

> The fact that the tubes run real hot could be also be due to leaky caps ! Also a solid state rectifier in the power supply could also boost the voltages in the power supply. Are you also using the correct impedance speaker?
> Nick
> -----Original Message-----
> From: Guido <laffitte at prtc.net>
> To: hallicrafters <hallicrafters at mailman.qth.net>
> Sent: Mon, Oct 31, 2011 6:55 pm
> Subject: [Hallicrafters] The hot SX28 6V6s
> 
> 
> The heat problem in the 6V6s of my SX28 was basically solved by lowering the AC 
> oltage to 110. Household voltage here sometimes soars to 125VAC. Lowering the 
> oltage with a Variac reduced the heat to what one could consider warm and  
> ormal. It was hot to the point where one could not touch the lid just above the 
> ubes.  The tubes still have some bluish glow left though. This tells a lot 
> bout the importance of operating these older rigs at the voltage for which they 
> ere designed. Anyone remembers when the voltages came up?
> 73s
> Guido KP4FAR
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