[GreenKeys] Teletype REC11 Rectifier "is NOT suitable for use in the signaling ... circuits of Teletype apparartus"

[Bruce Gentry]

I can't see why the power supply could not be used for loop circuits, it 
is very similar or even the same as circuits many of us have built for 
the purpose. If you have one, I would recommend replacing the selenium 
rectifier with silicon diodes of at least 1000 PIV rating so any 
transients don't fry them, and enlarge the filter condensor to about 300 
MFD. Beyond that, I think it would work fine. I do believe many of these 
warnings were for company political and financial reasons rather than 
technical ones.

      Bruce Gentry, KA2IVY

On 11/18/17 11:20 AM, Paul Birkel wrote:
>
> Regarding the Specification of the REC-11 Rectifier, as included in 
> http://www.virhistory.com/navy/manuals/tty/9M-index-4506.pdf, page 38 
> of 45, the description states:
>
> “The REC11 rectifier is designed to deliver continuously 0.6 ampere at 
> 120 volts D.C. from 105 to 125 volt 50-60 cycle A.C. single phase 
> power supply. The direct current from this rectifier is suitable for 
> operation of Teletype perforator punch magnets but is NOT suitable for 
> use in the signaling or local relay and selector magnet circuits of 
> Teletype apparatus.
>
> This rectifier consists of an insulated type input transformer with 
> variable secondary taps, a full wave selenium rectifying element, a 
> power factor correction condenser, a filter consisting of a choke and 
> a condenser, and a bleeder resistor. All parts are secured to a metal 
> base which has feet for shelf mounting. The rectifier is furnished 
> complete with cover, cords, and plugs for making A.C. and D.C. 
> connections.”
>
> The schematic and other information regarding the REC11 Rectifier 
> follow on subsequent pages.
>
> Why is this power supply suitable for use with perforator punch 
> magnets, but not the other types of circuits?  Inquiring minds …
>
> Thanks,
>
> paul
>
>
>
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