Ok. Since I posted this request I have found that Ten Tec doesn't have electronic versions of their manuals available. I've already emailed them for a quote on buying one. I did find some vintage ones for sale but they may not be authorized. Here's a reply from Ten Tec on the subject from a message board query in 2003. Thought it may be of interest to others.
Subject: [TenTec] FYI - copies of Ten Tec manuals FS
(Ten-Tec Inc. Amateur Radio Sales)
Date: Mon Mar 17 15:43:37 2003
If you notice copies of our manuals for sale as an ongoing enterprise,
I would like to hear about it. There have been various instances oof
this over the several years I have been here.
Ten-Tec does not authorize anyone to be a distributor of our equipment
manuals as we continue to hold title to them and make available copies
of manuals for virtually anything we have ever built.
There have been instances of Ten-Tec manuals available for sale on
CD-ROM - none of these are authorized by us. We have not made
copies of our manuals available (to date) in an electronic format.
Of course, a copy of a manual that was obtained from us as original
either as a replacement or with a piece of Ten-Tec equipment and
sold as a used, original manual as a casual sale is exempted. We are
only interested in preventing our copyright from being violated.
Amateur Radio Product Manager