From: "Mike Dorworth, K4XM" <[EMAIL PROTECTED]>
> I assume all three grids simply strapped together. Is that correct?
>
> In some circuits with triode-connected tetrodes, particularly the 807,
the
> screen grids are driven directly with the audio, and a resistor is
placed
> between the screen and control grids.
>
No, he had the screen and control grid strapped and fed. The supressor was
biased in the center tap of the driver transformer with the voltage
indicated.
I overlooked the suppressor voltage you had listed. With the relatively
high positive voltage on the suppressor grid, and audio on the cotrol/screen
grid, it looks to me like this would better be called a pentode connected as
a tetrode, not as a triode. The suppressor grid, with the steady +DC acts
more like a screen grid, and the control/screen grid act like a control
grid.
Don k4kyv
_______________________________________________________________
This message was typed using the DVORAK keyboard layout. Try it - you'll
like it.
http://www.mwbrooks.com/dvorak/
http://gigliwood.com/abcd/
