Steven Cook wrote:
>Team,
>
>I've acquired an older Henry 2K-4, which only has one High Voltage setting ~
>3500V no load.
>
>It runs a pair of 3-500z triodes and will be driven with ~100W
>
>My question concerns running the amp at reduced output on CW and if it is
>better to:
>
>1. Apply full drive, and adjust C1 and C2 until the desired level of output
>is achieved...
>
>or as some have suggested:
>
>2. Apply full drive, adjust C1 and C2 until maximum power is achieved, then
>reduce the exciter drive without readjusting C1 or C2.
>
>What is the ramification of starting out with reduced drive, (like 25 or 50
>Watts) and adjusting C1 and C2 until maximum output is achieved?
>
>
Very simplistically, 1 (correctly adjusted) gives you highest efficiency
at the expense of gain and linearity. I think 3-500s were designed for
class C and continuous operation, so there should be no worries about
tube stress. Harmonics might be higher, but whether you will see a
signiicant difference in what's radiated will vary according to
filtering/atu/antenna.
2 gives you best linearity at the expense of efficiency - your keying
waveform will be least affected.
Tuning for max output at reduced drive gives you highest gain, so you
can run your exciter at lowest level for any given final output.
Nothing I can think of that's fundamentally wrong with any of them.
Steve
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|