[Moon-net] Triode grid current

[LANCE COLLISTER]

Wilt Barnum wrote:
> Hello all, I have a pair of 3cx800s back in service after a long time. I cannot seem to find the point of minimum grid current and max output. Can anyone suggest a tuning proceedure? and the relationship of anode loading to proper tuning?
> 
> Thanks, Wilt W1IPL
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> 
Hi Wilt,

I have never operated the 3CX800A7 tubes, but I know with my 8877 amplifiers, I have 
always tuned up the tube as W6PO instructed me years ago.  That was to peak the 
output while adjusting the input tuning as well as the plate tuning and loading. 
Then, as you get closer to maximum power ratings, you can tweak the plate loading 
control slightly to reduce the grid current with very little change in output power. 
  Then re-peak the tuning controls for maximum output at that loading setting.  This 
technique has worked very well for me in finding the optimum safe performance 
settings for the tube.  GL and VY 73, Lance

-- 
Lance Collister, W7GJ (ex: WN3GPL, WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8)
P.O. Box 73
Frenchtown, MT  59834  USA
QTH: DN27UB
TEL: (406) 626-5728
URL: http://www.bigskyspaces.com/w7gj
2m DXCC #11/6m DXCC #815