[Milsurplus] AN/TNH-21 tape deck manual needed - NSA?

[J. Forster]

Nothing on the book, but you might look for a burnt out light bulb if the
capstan servo has an optical encoder or a stuck brush if it has a DC
tachometer.

FWIW,
-John

===============



> I've just acquired a nifty AN/TNH-21 tape deck (4 channels, 5 speed)
> that was used by the Navy and others for signal intercept and
> analysis.
> Photos at http://www.navy-radio.com/record.htm
>
> But I need a manual as the capstan servo is running open loop and it
> sounds like an F-104 spooling up for takeoff.
> I have found this reference to a manual -
> "AN/TNH-21 Recorder-Reproducer Set, Sound, Instruction Manual,
> National Security Agency, Fort G.Meade, MD, December 1973."
>
> and a NSA video tape catalog lists
> "AN/TNH-21 RECORDER (U) TVC-608 1974
> Running Time: 357:56 Classification: Unclassified 9 Parts
> (U) A nine-part maintenance series on the TNH-21 including:
> introduction; system specifications;
> capstan servo system; phase comparator; system power supply; circuit
> analysis; drive
> circuitry; and counter reset. (Black and White)"
>
> So, any suggestions on how to get hold of an NSA manual or video?
>
> cheers,
> Nick
> www.navy-radio.com
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