[GreenKeys] TT-4A

[WA5CAB at cs.com]

I don't think that is actually the case (that the TT-4/TG was never fielded). 
 According to a Supplement to TM 11-2234 that I have here, commencing serial 
number of TT-4A/TG was 1392.  Which means that 1391 TT-4/TG were probably 
built.  However, given the relatively minor differences between the two listed in 
the Supplement, I would guess that a Depot drew back the TT-4's and converted 
them to TT-4A's.  I could cite as other examples of this sort of thing being 
done the PE-162-B and the SG-12/URM-48.  All of the former I have ever seen are 
actually PE-162-C and the latter SG-12A.  I've been looking for years for an 
unmodified (original) version of both.  The difference, though, between them 
and the TT-4 would be that for no machines with TT-4 nameplates to be around 
would require that they also changed the nameplates (which is actually the 
logical thing to do).  With the generator and the signal generator, they didn't.  I 
bought two PE-162-B and one SG-12 before discovering that probably no 
unmodifed ones remain.  If anyone has an unmodified version of either, please contact 
me.

There is, however, no conclusion to be drawn about the TT-4 manual being TM 
11-2234 and TT-4A,B manuals being TM 11-5815-206-nn.  The manual numbering 
scheme change occured in the mid 50's +/-2 and applied to all Technical Manuals, 
not only TM 11's and not only the ones on the TT-4.  This was the change from 
the short number to the long number scheme which coincided with the change from 
a single manual covering operation, maintenance and parts to separate volumes 
for each area.

In a message dated 12/10/2007 9:50:47 PM Central Standard Time, 
duncanancy at earthlink.net writes: 
> I did not realize that the "TT-4" was never fielded; but now that you
> mention it, I do not remember ever seeing any that were not "TT-4A",
> "TT-4B", or "TT-4C".  I spent a year in Viet Nam maintaining TT-4s (along
> with a few TT-76s &TT-98s).
> 
> The original manual, TM 11-2234, 6 April 1951, is titled "Teletypewriter 
> TT-4/TG".  But the operator's manual that replaced it, TM 11-5815-206-12, 8
> April 1959, just covers the "TT-4A &"TT-4B" with no mention of the
> original "TT-4".  The most recent TM  on the TT-4 I have seen is a change
> notice to TM 11-5815-206-12, dated 13 Jan 1984.  So the Army apparently
> used the TT-4 for over 30 years!!

Robert & Susan Downs - Houston
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