[rescue] Looking for a manual - slightly OT

[Larry Snyder]

A friend of mine recently scored a working Systron-Donner spectrum
analyzer on ebay.  He's trying to find a manual for somewhat less
than the $150 he was quoted by the folks that acquired the
product line.  Here's the particulars:

Systron-Donner model -- 763
USAF designation -- TS-3713(v) 2/U

>From the contract number, it looks like a 1977 box.

suggestions?
TIA,
-ls-