[GreenKeys] Teletype near Toronto

[Teletypeparts]

Often, "private line model" is used to refer to connection to a computer, but it really means 60 MA two wire.  The 33 can be easily strapped for the two different versions.  Just a couple of things to change.  The quick check is 2 or 4 wires hanging out the back.  .  

Wayne





-----Original Message-----
From: Bill Horne <bill at horne.net>
To: greenkeys <greenkeys at mailman.qth.net>
Sent: Thu, Apr 28, 2011 1:29 am
Subject: Re: [GreenKeys] Teletype near Toronto


On 04/27/2011 12:15 PM, Jim Haynes wrote:
 On Wed, 27 Apr 2011, densmore at kaponline.com wrote:

> Price is right.
>
> http://ontario.kijiji.ca/c-buy-and-sell-electronics-Old-Style-Teletype-Machine-W0QQAdIdZ270451876
>
> Keith VE3TS
>
 And it's the private-line model preferred by old computer restorers.
I'm curious: did the private line model use electronic line current 
ensors, or where there polar relays in them? I trained on Model 32/33 
n 1976, but the class just barely covered the electronics: I remember 
here was a transistorized driver for the selector magnet, which took 
everal hundred milliamps, but that's all they taught us.
I know they could be strapped for 20 ma current loop, and probably for 
0 ma (they say the memory is the second thing to go), but I never 
orked on a machine that was actually in use for private line: ours had 
0 ma <> RS-232 converters on them, and they were attached to DEC computers.
Bill, W1AC
-- 
"I'm not trying to tell you that I've seen the plan
 Turn and walk away if you think I am
 But don't think to badly of one who's left holding sand"
              - Jackson Browne
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