[AMPS] High filament voltage etc

[2]

>
>I have an amp that runs a single 4CX800.  Knowing various ways to
>limit the filament voltage, I haven't bothered to do it yet. It runs
>about 12.9 volts.  My question is, how does this come into play
>regarding other voltages?  In otherwords will high filament voltage
>cause idle current to be on the high side? If that is the case, then
>the grid bias would need to be higher compared to a tube that had
>12.6v on the filament.  Or would the hiher fil voltage not make a
>difference?
>
The 4cx400 has a heater-type cathode.  When the heater V is high, 
barium-oxide migrates from the cathode to the grids.  This is not good.

cheers, Doug

-  R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures.  
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