[Elecraft] TS520S and KPA500/KAT500

[Martin Sole]

I might be way off here but from what I recall these older vacuum tube 
final amplifier radios have output that is variable in fixed carrier 
modes such as CW but which almost always produce full output in SSB. You 
might be able to reduce output by winding back the mic gain but it will 
likely sound a bit "thin" and any loud noises over an above nominal 
speech will produce more output. When you set the carrier or drive 
control that only has an effect on the CW output, it doesn't set the SSB 
output.

I recall a common way to limit the output of these radios in SSB mode 
was to feed a dc voltage into the external ALC input of the rig in order 
to have it reduce power.

Martin, HS0ZED



On 22/07/2018 08:59, Nr4c wrote:
> I want to use a Kenwood 520S with my KPA500 amp. I have the cable from the 520 Remote connector to amp PTT IN.
>
> I assume I should tune up radio with dummy load and then turn Drive down low and switch amp to Operate. Now turn up drive to get desire amp output.
>
> Now I ask, “What have I forgotten (or never knew about tube radios))?”  Anything else I need to pay attention to or what am I missing?
>
> Sent from my iPhone
> ...nr4c. bill
>
>
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