[Amps] Quad Tube 4cx800 hf amp

[Manuel R. Alonso / KC4MNE]

Hello

Would it be feasable to build a 4  tube amplifier using the 4cx800 russian tubes.

I calculated a plate impeadance of about 490 ohms, using (2600V 3.0 amp supply)

However for a Pi output I am looking at a c1 value of about 100 pf at 29MHZ and each tube has 51pf of capacitance already, if added together thats over 200pf.  How is this obstacle corrected?

Manny

KC4MNE