[Amps] Quad Tube 4cx800 hf amp

[Peter Voelpel]

Hi Manny,

51pf of output capacity is very unlikely for such a small tube, it will be
not more then 10-15pf for sure

73
Peter

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Manuel R. Alonso / KC4MNE


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
 
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