The 200-400 uA leakage is excellent, within the recommendations of CPI/Eimac
for their H2O cooled tubes. Your Russian tubes should last a long time if the
emission is strong.
I use water cooling in 100% of applications that I work with but for reasons
that their are no air-cooled tubes at the power levels required. The newest PA
in development uses
Hypervapotron cooling, which is multiphase (boils water at the anode and
converts to liquid before exiting the tube). This combines the advantages of
vapor phase cooling with
the simplicity of water cooling. Lower flow than conventional H2O cooling,
however.
John K5PRO
> have the heat exchanger grounded through a 0-1ma meter....My water
> reservoirs contain 12 liters of distilled water....Current leakage to
> ground is typically 200ua at room temperature rising to around 350-400ua
> at 40C....It takes a long CW session to warm the water past 30C with
> this system...
> Bob..VK3ZL..
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