[Milsurplus] Re: BC 191, etc

[WA5CAB at cs.com]

Marty,

You're correct.  There is no provision or circuitry to adjust the B+, only 
turn it on or off by applying bias voltage to the thyratron grids or removing it 
which draws the grids down to ground through shunt resistors.  The RA-34-H 
and -J have a single transformer for all functions to the B+ switching is done 
in the high AC lines instead of the transformer primary as in earlier models.

In a message dated 9/30/2007 10:06:42 AM Central Daylight Time, 
cosmoline at aa4rm.ba-watch.org writes: 
> Robt I think ALL RA34s used choke input w. big bleewder to get, mebbe,
> 5% regulation.  In retrospect I think RA34-H just used thyratrons
> for B+ on-off.  Overkill
> 
> Have to go back to hbk nearby I got fm WA5CAB.

Robert Downs - Houston
<http://www.wa5cab.com> (Web Store)
MVPA 9480
<wa5cab at cs.com> (Primary email)
<wa5cab at comcast.net> (Backup email)
   
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