[Amps] Russian caps

[Carey Lockhart]

hello group,

i need to change my flapper style caps in a dual gs-35b 2m amplifier. i 
was looking at the common russian seen here

http://www.ebay.com/itm/Vacuum-Variable-Capacitor-4-100pF-5kV-10kV-New-in-Box-/151008917961?pt=US_Radio_Comm_Antennas&hash=item2328d539c9

i have used them with success on sic meters. but i had not noticed the 
cutoff frequency. any suggestions. or should i maybe use standard air 
variables. my plate is only at 2800 volts and my input is around 3800 
watts or so.

-- 
Carey Lockhart, kc5gtt
Boerne Texas EL09pv
www.kc5gtt.com