[Moon-net] filaments

[Keith Naylor]

This is pretty old amp and has a history of unreliability.....

Designed well before people paid too much attention to the caring of 
thoriated-tungsten tubes.
(BTW, the Eimac spec is 7.5V +/- 0.37V)

73'

Keith G4FUF


Peter Voelpel wrote:
> The heater voltage of the 4CX10000D in the Racal TA1800 10KW amplifier is
> run at 6,8V in standby mode.
> It is raised to the nominal 7,5V only when EHT is switched on (operational
> mode).
>
> 73
> Peter
>
> -----Original Message-----
> From: moon-net-bounces at list-serv.davidv.net
> [mailto:moon-net-bounces at list-serv.davidv.net] On Behalf Of Keith Naylor
>
> Running the heaters for some time at a voltage below the manufacturers
> rating will poison the cathode !
> Net result is a bang when you apply EHT and usually lower emission.
>
>
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