[GreenKeys] TTY Loop Supply

[Nick England]

In the same vein, I'm a newcomer to TTY, and am interested in what the conventions for wiring were. 

All the Navy gear I have been messing with have loop supply POS feeding the current limiting resistor, then looping jacks, then set jacks, then LINE to NEG (ground). This scheme works fine with various converters like the sainted URA-8A which has a tube plate output switching to ground. OK so far. 
Then I started to hook up a TT-63A regenerative repeater, something that ought to be commonly found in USN TTY centers. Input is Neg to Gnd!
Yeah it is easy to drive a grid that way, but how did these things co-exist? 

Was this a usual thing to mix up loop polarities willy-nilly and stick polar relays in between them to get right side up? Or was there a real convention that people tried to follow?
Cheers,
Nick
(phone email acct)


On Apr 28, 2014, at 5:14 PM, Chris Elmquist <chrise at pobox.com> wrote:

>  I note the "TIP NEGATIVE" notice on the front panel.
> Was that any sort of convention or was the rule that you just had to
> state what the polarity is?
>