** I would run it at 3100v, but only for SSB and CW. For RTTY, I would
run less. .
>I'm in the process of upgrading my 4CX1600B amplifier deck to a pair of
>4CX800a/GU74Bs.
>The maximum plate voltage for the 4CX800A is 2.5 kV per the data sheets. My
>existing power supply voltage is 3.1 kV unloaded and 2.8kV loaded at 800
>ma. My
>question for the group is has anyone tried using the 4CX800A at these higher
>voltages with any success?
>I'm trying to keep the existing transformer and there is no way of lowering
>the secondary voltages via taps. The HV supply is a full wave bridge
>capacitive
>input circuit and there isn't enough room for a HV choke so it's either run
>the tubes at 3.1kV/2.8kV or replace the transformer.
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>
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