[sdiy] Hollow low-pressure ladder filter

[eric b]

>> oh YES by all means...use the PENTODES...
>> I wanna see how you bias the grids  ;^)

Voltage divider from plate to cathode,
center point to screen;
plus a coupling-size capacitor from
screen to cathode.

Even if you use it in a ladder, the
screen voltage will remain a fixed 
fraction of the plate voltage, exactly
what the tube will want to see.


Eric Barbour
Svetlana Electron Devices
Portola Valley CA USA