[Amps] Has anyone ever actually build an 833A linear?

[KA4INM]

   Mike Waters wrote:

> How about adding a tertiary winding to the step-up transformer, and use
> that for the out-of-phase neutralizing signal? One end of the winding to
> ground, the other end to a neut. capacitor connected to the plate?

> You may be right on the requirements of the drive signal to the swamped
> grid. I have a couple of ideas there.

   The thing about 833s boils down to when 1 kW INPUT was the rule, 813's were available for $5 to 
$15 NOS each and a pair in P-P using B&W 1 kW coil sets worked 160 to 10 meters class "B" for 1 kW 
in.  (look in handbooks published before 1955)

   833s were used in older (from the 40's) broadcast transmitters with no fans or blowers for 500 
and 1,000 Watts unmodulated carrier out with long life and trouble free operation.  The power 
capacity of the 833 was just not necessary for HAM HF operations.  One tube giving you 500 Watts was 
frequently done, but only where GOOD pulls were available, few radio stations stations using 833s 
removed a GOOD tube, unless a HAM worked there and wanted a free used tube.  4-400s are in the same 
category, just different transmitter makers.
-- 
   Ron  KA4INM - Youvan's corollary:
                 Every action results in unwanted side effects.