[GreenKeys] Western Union Rectifier 69-B

[David Burns]

Ummm I was thinking of the big 866 half-wave mercury vapor rectifiers.  NVM!

On 4/24/2012 1:05 PM, DR HOUSE wrote:
> Not sure where the "base down" comes from. The 83 in the TV-7D/U tube 
> tester is horizontal.
> However the operation of a tube tester is not continuous.
>
> ??
> Don
> K9TTY
>
>
> On 24 Apr 2012, at 8:46 AM, David Burns wrote:
>
> Derek...
>     When Western Union stopped supporting their own machines
> (non-Teletype) in 1966, I received one of their Model 100 machines
> (surplus) with exactly this power-supply for the local loop!  Mine had
> solid-state diodes instead of the 83 tube, but it looks like you have
> -the real deal- here!  (Wish I still had mine from 50 years ago!)
>
>     The power supply I received had a larger (physically) adjustable
> resistor.  The one wired into my machine was probably a 20 or 25 watt
> resistor.  Mine was adjusted for 60 ma for my particular machine (and it
> was inside the machine, not strapped to the top of the supply as yours
> is)  If you adjust yours for 60 ma and it doesn't get too hot, you're
> good to go, right?
>
>     Mine had the metal capacitor, and in 1966, it worked fine.  I
> seriously doubt the exact value is crucial...you just want the bulk of
> the full-wave rectification ripple knocked out of the output waveform.
> I'd check the old metal one for a value printed on the side.
>
>     Bear in mind that the 83 tube (if you're going to use it ....and I
> would!) should be operated with the base down, I believe
>
>     Looks Like Fun!!
>
> ..Dave in Boston
>
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