Hi Tomm, measuring plate load impedance is a tough job for a typical ham
project. For that reason we tend to calculate that and hope it is close (it
will
be).
In practice, the tuning process optimizes the plate load for maximum power
transfer so there is no real need to measure it directly.
As far as the other data, you will be very close by taking the single tube
data and scaling it by two. ie: plate current X2, drive power X2, with the
plate voltage X 1 of coarse. The input impedance would be divided by two as
would
the plate load impedance.
You can also operate a pair of tubes with the single tube data and have a
super conservative, long tube life design. In this case the plate idle current
can be set at 2 X single tube for improved linearity and/or reduced drive
requirements.
73,
Gerald/K5GW
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