Ian White G/GM3SEK wrote:
> Phil Clements wrote:
>
>>>>I believe I've read on here before where some owners have built MONO band
>>>
>>>amps but powered them all from a single power supply. So, one power
>>>supply deck and TWO RF decks. It has been suggested that I use vacuum
>>>relays to switch between the two RF decks. I was hoping to have them both
>>>run in standby at the same time. I obviously do not know enough and am
>>>therefore here seeking guidance. I will only operate one amp at a time.
>>
>>Frank Donovan, W3LPL is probably the world's best source of info on
>>this type of lash-up. His multi-multi contest station, as I recall, had
>>amps for each band, with only one power supply. It may still be in
>>operation.
>>
>>No, you don't need any relays to switch HV; just excite the amp you
>>want to use. I would highly recommend HV glitch resistors in each RF
>>deck, and also in the power supply.
>>
>
> A separate resistor in each amp would reduce interaction and voltage
> drop, but a resistor is needed in the power supply as well, to handle
> the situation where one of the B+ leads shorts to ground.
>
> Each amp also needs its own separate anode and grid current metering. A
> Triode Boards customer is looking at this right now, and I think I've
> second-guessed how Frank must have done it, with isolating diodes in the
> B-minus return.
>
>
What about if you don't light the filament on each amp?
73
Gary K4FMX
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