[AMPS] 572-B Input impedance?

[Jerry Devine]

>Peter G3RZP wrote:
>My experience with 572s suggests that operation at 50 MHz is going to be
>interesting from a stability point of view. The grid leads are just far
too
>long for operation up there. Series tuning might help, but what the
>efficiency will be is another matter. I'd use something else.

>John	ZS5JF wrote:
>grid to plate = 6.0pF
>grid to filament = 5.9pF
>Plate to filament = 0.8pF

>I guess if the grid isn't totally, solidly, held to chassis and
everything else >using low inductance grounding then this tube will make
a superb oscillator!!  
Thanks for data John, I can stop hunting for my own copies...
Thus, I agree.  I remembered it's upper was 30mhz but that doesn't
usually mean they can't be pushed always |-).  I think Phil
should start thinking FET or 3-500z or 4cx400a or 4cx800a. 

73,    Jerry                                     krr2ak@juno.com
[text|uuencode|59kb ea]                                                  
        'Our people are warriors,  often savage, but we are also many
other pleasant     things'

73,    Jerry                                     krr2ak@juno.com
[text|uuencode|59kb ea]                                                  
        'Our people are warriors,  often savage, but we are also many
other pleasant     things'

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