[GreenKeys] TT-4 vs TT-4A

[Pete Lancashire]

If I am able to get that original TT for manual somebody offered and get
this scanned I think I'll make my goal and find out what is wrong with the
4A that I have

And then do a quick oil and lube per the manual.

I don't want to bother GK right now until I figure out its electrical
problem. Considering the thing appears to have zero hours on it I'm
thinking it's more based on just sitting around for the past 20-plus years.



On Wed, Jun 27, 2018, 10:01 AM Duncan Brown <duncanancy at earthlink.net>
wrote:

> Ken,
>
> The TT-4 was the first TTY that I really got to know. I spent a year in
> Viet Nam servicing them.
>
> Thanks for posting the Nov 1951 supplement. I had not seen it before.
> It answers some questions of the early TT-4 history, but raises others!
>
> 1. In Edmund E. Kleinschmidt's book, "Printing Telegraphy... a New Era
> Begins" (http://www.gutenberg.org/ebooks/53481), he says that the Signal
> Corps approved the KLI design for a new tactical printer, to be
> designated "TT-4/TG", and gave KLI an order for 2,000 units in 1949. On
> 17 Apr 1950, the first KLI pre-production samples were sent to the
> Signal Corps for their approval. Soon after, production began on the
> contract awarded in June 1949. A copy of the front of KLI's preliminary
> TT-4 manual with contract number (235410-0Phila - 49) enclosed.
>
> 2. The first official Army TT-4 manual was TM 11-2234, "TT-4/TG", 6 Apr
> 1951.
>
> 3. Ken's "Supplement to TM 11-2234, Teletypewriter TT-4/TG" is dated 28
> November 1951. It adds the TT-4A/TG for serial numbers 1392 upwards.  It
> implies that Order Number 1671-Phila-51 covers these TT-4As from SN
> 1394.  My first thought was that the SNs from the TT-4/TG models
> continued with the TT-4A/TGs (ie, everything 1392 and below was a TT-4/TG).
>
> Having worked in new-product hardware design, I know that  a lot of
> problems can surface after you have manufactured hundreds of units that
> you didn't see in the first prototypes. So it is not inconceivable to me
> that, somewhere in the midst of the first 2,000 TT-4/TG units, they
> switched over to the TT-4A/TG model.
>
> 4. But there are TT-4A/TG models, manufactured by NCR, out there with
> SNs below 1392 (eg #316, #1132) . The NCR units were built to order
> number 6611-PHILA-51. So the NCR units were not covered by this Nov 1951
> supplement?  (I have seen mentions in other TMs  of differences between
> different Order Numbers within the same model number.)
>
> 5. The statement on the Nov 1951 supplement, that it is not an official
> DA publication, implies that it came from the manufacturer (KLI?). Was
> there another supplement for the earlier TT-4As made by NCR?  It also
> seems strange that they waited until 1959 for the official next edition
> (TM 11-5815-206-12, -35). The fact that the later TMs do not mention the
> "TT-4/TG", implies that there were none in the military system by then.
>
> 6. Pete - what is the label on your TT-4A?
>
> 7. In Viet Nam in 1967, we had TT-4Bs & TT-4Cs that were running 24/7
> and getting pretty beat up. We were able to negotiate for some "new"
> replacement units. I was looking forward to the new units and was very
> disappointed  when they appeared as "rebuilt" TT-4As!  But I'm pretty
> sure that they all had KLI labels on them, as I don't think I knew about
> the NCR units until relatively recently.  Does anyone out there have a
> KLI branded TT-4A??
>
> Thanks for any further comments or info on the TT-4 family
>
> Duncan Brown, K2OEQ
> USASA  31J30
>
> Antique Wireless Association Museum Asst. Curator, Commercial Equipment
> (also Chief TTY operator & repairman)
> http://www.antiquewireless.org/
>
>
>
>
> ---
> This email has been checked for viruses by Avast antivirus software.
> https://www.avast.com/antivirus
> ______________________________________________________________
> GreenKeys mailing list
> Home: http://mailman.qth.net/mailman/listinfo/greenkeys
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:GreenKeys at mailman.qth.net
>
> 2002-to-present greenkeys archive:
> http://mailman.qth.net/pipermail/greenkeys/
> 1998-to-2001 <http://mailman.qth.net/pipermail/greenkeys/1998-to-2001>
> greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html
> Randy Guttery's 2001-to-2009 GreenKeys Search Tool:
> http://comcents.com/tty/greenkeyssearch.html
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20180627/7071899b/attachment.html>