[Amps] Quad Tube 4cx800 hf amp

[Will Matney]

Manny,

You can add a small amount of inductance between the coupling caps and Tune C to drop it thus making it a L-Pi circuit. 

Best,

Will

*********** REPLY SEPARATOR  ***********

On 5/25/06 at 9:50 PM Manuel R. Alonso / KC4MNE wrote:

>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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