[Amps] [BULK] - One PS, many amps

Steve Katz stevek at jmr.com
Thu Oct 6 15:49:13 EDT 2005


I run multiple RF decks from a common power supply and don't switch anything
except the "amp key" line, and that's only to avoid wasting power dissipated
in tubes that aren't doing any amplifying; I can't understand the need to do
so.  -WB2WIK/6

-----Original Message-----
From: W2RU - Bud Hippisley [mailto:W2RU at frontiernet.net]
Sent: Thursday, October 06, 2005 12:34 PM
To: amps at contesting.com
Subject: [BULK] - [Amps] One PS, many amps


Dino Darling 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.
>  
>
Years -- no, that's not quite right -- decades ago, W1MX used just such 
a system.  We had a bunch of HF monoband push-pull 304TL amplifiers tied 
to a single HV supply.  We had a single Collins exciter.  When we 
changed bands we switched only two functions -- the RG-58 from the 
exciter, and primary power to the 304TL filament transformer in the 
selected amplifier.

So obviously I don't know enough, either, because I'm not understanding 
what the suggested vacuum relays are for.

Bud, W2RU
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