Dick,
> I use a common HV supply for my 6M and 2M amps that use 8877s.
> However, I have the heater voltages on each tube set up with 3 minute time
> delay so I can never make the mistake of applying the HV without having had
> the
> heater warm and ready to go. I use a vacuum relay to switch the HV and a
> fail
> safe system that prevents the HV from going to either amp if the selected
> amp's
> heaters have not been warming up for 3 minutes. Good luck.
> Roger K8RS
>
You went to a lot of trouble and expense. The HV can be there all the time.
You just need to prevent the PTT relay from closing for 3 min. after the
filament
lights. All Alpha amps that use 8877's apply HV the instant you turn the amp on.
(((73)))
Phil, K5PC
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