>
>
>On Thu, 3 Sep 1998 13:29:00 +0200 pfrenning@idc.com writes:
>>
>>I have acquired a Spectraphysics Laser amp case with 2x4CX350
>>(presumeably in
>>good condition) and I'm about to embark on a rebuild job for 6 meters.
>>My current design plan (based on input from several club-members) is
>>as follows:
>>The two tubes in parallel, grounded grid2; -300V cathode; variable -30
>>to 300v
>>grid1 bias; 2400V (350mA) EHT (40uF/2500V MP cap.); tuned input with
>>6-10 dB attenuator, pi-tank.; various control and interlock electronics and
>>startup/inrush timing.
>
>The grounded grid design is viable .....
Grounded screen (a.k.a. grid-2) is not "grounded grid" unless the grid
is also grounded .
For the 4cx350, the grid dissipation capability is probably of too-low to
safely permit grounded grid operation.
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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