It can be corrected by removing 2 of the tubes. A pair can easily run the
legal limit ++.
Bob W6TR
----- Original Message -----
From: "Manuel R. Alonso / KC4MNE" <kc4mne@bellsouth.net>
To: <amps@contesting.com>
Sent: Thursday, May 25, 2006 9:50 PM
Subject: [Amps] Quad Tube 4cx800 hf amp
> 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
>
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