I always thought, that for the loading capacitor, you just use the old
"Power = V squared over R" formula.
You know R is 50 Ohms, and you supposedly know the power, so you can
work out the voltage from there.
For example, for an output power of 2kW, V squared will be 100,000,
therefore V will be 316V.
Your 1200V capacitor will do the job with adequate headroom., when your
system is all tuned and matched.
73, Alek. VK6APK
On 19/08/2017 6:07 PM, Conrad PA5Y wrote:
Hello what is the rule of thumb for conservatively estimating the
required ratings for a load capacitor when used with a mono band Pi-L
tank circuit?
Anode voltage 2750V
Tube design RL = 2600 ohms
Q = 12
I have searched on the internet an I cannot find any really convincing
info, I have something that will stand 1200V but that is marginal and
will not survive a fault I expect.
Alternatively does anyone have a small vac variable around 40-60pF
that is around 3 inches/76mm? That will obviously do the job.
Also where can I buy a couple of Ohmite Z-50 chokes in Europe? Anyone
got one or two that they can spare?
Regards
Conrad PA5Y
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