Re: VTTC grid leak

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: Mddeming-at-aol-dot-com 

In a message dated 9/1/04 10:02:18 AM Eastern Daylight Time, 
tesla-at-pupman-dot-com writes:
Generally, the heavy duty power triodes (like the 833A etc) need positive
grid swings with lots of grid current to achieve their rated output. However
you also get RF power tetrodes and pentodes that need practically no grid
current, and would probably be damaged by too much grid drive.

Steve C.

Hi Steve, All,

     In Tech Manual TT-5, RCA makes the following recommendations for the 
833-A as a class C oscillator operating at 1.6 KW ICAS
Plate voltage 4000 V
DC Grid voltage -225 V
Grid bias resistor 2400 ohm
Peak RF grid voltage 415 V
Grid driving power 35 W
Peak DC grid current 95 mA
Peak DC plate current 500 mA

The Manual also shows that the 4-125A exists in two configurations: as the 
4-125A/4D21 and the 6155/4-125A. The main differences are interelectrode 
capacitances, operating temperatures, and socket types.

The RCA Manual is available as a reprint from Antique Electronic Supply of 
Tempe, AZ. It contains specs on transmitting tubes up to 5 KW ratings, 
contains some good power tube theory and applications and even shows the 
proper spelling of TUBE. ;-)))

Matt D.

Ill-iterazy SUX!