[Test-Equipment] Weston Sensitrol Relay

[Ron Youvan]

n2lxm at juno.com wrote:

>          During my cleaning up of the Shop/shack( Yea I know, Sacrilege )
> today I came across an 1 - 0 - 1 microamp Sensitrol Really. I have seen
> these in the pass, this one was in a box of stuff given to me by a fellow
> club member who has moved out state.  I would like to know how one would
> use one. The back of the meter has five(5) connection studs and a long
> tube with a Blue and Red wire coming out of it. The case is stamped MAR 2
> 1953, so this old girl is over fifty Seven years old. Any information
> would be helpful.

   One use would be in a HP amplifier in series with a grid, control or screen
with a 1 or 5 k Ohm pot across it to adjust the sensitivity.
The contacts would press the [off] button on the hV power supply control system.
The control would be set with a load resistor and a miliAmmeter in series across
the tube elements.
Excessive grid current would kill the hV power supply if sunk or emitted.
-- 
    Ron  KA4INM - nothin's quite as sure as change
                  from "look through my window" - The Mamas & The Papas