[Amps] Quad Tube 4cx800 hf amp

[Bob Maser]

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 at bellsouth.net>
To: <amps at 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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