Re: new single 833A VTTC and RED plates

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

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

In a message dated 12/23/03 3:03:21 PM Eastern Standard Time, 
tesla-at-pupman-dot-com writes:
Snippp-----------
The general consensus (from them) is that the 833C tubes which have graphite
plates cannot be run "red" as you would say as
they will quickly become damaged at the power levels necessary to make the
graphite plates glow.  However, they say its
normal to run the 833A tubes "glowing red" as its normal for that type of
tube and plate material.

Snippp-----------

I realize that manufacturer's specs are anathema to many coilers. However, 
for newbies and those who want long tube life, I enclose this from RCA 
manual TT-4:

833A as a class C oscillator with natural cooling:
  Max plate voltage 3300 V, Max grid voltage -500 V, Max plate input 1500 
W, Max plate dissipation 350 W, Max plate current 500 mA, Max grid current 
100 mA. Max plate and grid seal temp 145C. Plate shows orange-red color 
when operated at maximum ratings.

833A as a class C oscillator with 40cfm cooling from 2" nozzle directed 
vertically between plate and grid seals:
Max plate voltage 4000 V, Max grid voltage -500 V, Max plate input 2000 W, 
Max plate dissipation 450 W, Max plate current 500 mA, Max grid current 100 
mA. Max plate and grid seal temp 145C. Requires fixed bias of at least -90 
V. Plate shows orange-red color when operated at maximum ratings.

Hope this helps,

Matt D.