[R-390] R-390 Mechanical Alignment

[Jacques Fortin]

Hello Tom and Bill,

The "23 October 1953" R-390 original manual which I once had in hands was
coming from the Canadian Army, Kingston Museum of Communications.
It seems to be a pre-issue of the TM11-856.
This is the only R-390 manual I have seen that identifies the ballast tube
as being a 2HTF11B instead of a 3TF7.
The number of copies still available could be very small.
This manual applies only to the first production Collins units, before any
of the Engineering Changes (1,2 and 4) were issued.
It also contains some information that are not found in the later manuals,
like a complete table of parts with their Signal Corps Stock Numbers.

Also, if any of you experience problems during the restoration of your
R-390, do not hesitate to ask for help.
I've been thru a couple of issues with mine, so maybe I will be able to give
more advice.

73, Jacques, VE2JFE in Montreal