One popular HF amp today (I own one) is designed so that when one flips
the power switch the fil, fan and HV all come on. There is no CW/SSB
switch as on some of the older amps. i.e. SB-220 and Drake L-4B (I
recall). This amp runs a pr of 3-500Zs with a key down output of 1500+
watts. Duty cycle is 50% or 10 min on and 10 min off. The standby
switch only defeats the T/R switching. And yes, it's full QSK.
Now, my 8877 on 144 MHz is a different animal. It takes a full 1 min
for the heaters to get the cathode up to operating temp. Here, it's
smart to wait til the thing warms up.
73
Bob K4TAX
Pete Smith wrote:
>
> At 02:03 PM 2/2/01, Jeff Wolf wrote:
> >
> >The SB220 should ALWAYS be started in the CW position to limit inrush
> >current. NEVER start the SB220 in the SSB position, as it puts too much
> >strain on components.
> >
>
> Never heard this before. I never do it this way. Don't think it's really
> a problem.
>
> But I do agree, the best cosmetic and operational solution is to use the
> push-pull switch on the sensitivity pot.
>
> 73, Pete N4ZR
> Contesting is!
>
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