At 11:18 10/18/98 +0100, you wrote:
>I've got a few tired 4CX1000A ex-broadcast 'pulls', and
>want to revitalise them a bit, if it's possible.......
>73 Chris GM3WOJ/GM8V
><chris.tran@zetnet.co.uk>
>
Chris, I've heard from someone who serviced milatary 4CX1000A amps that
extended operation of the heater without any other potentials applied will
lead to low emmision. I have heard this in other forms thru the years and
it may just be another "old wives tale", who knows?
I do knoe that on one 4CX1000A I own, that increasing the heater voltage by
5% above normal brought it's emmision back up to almost spec. It made an
unuseable tube quite useable in normal ham service.
Good luck
Larry - W7IUV
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