Hi,
I'm a bit of a stranger to RRAB as I mostly visit RAR+P for civilian
sets (my main hobby.)
However, I am helping restore a 1944 Lancaster bomber at CASM (see
http://casmuseum.org/about.shtml); my part is the avionics, in
particular a Bendix RA 10DB comms and DF receiver.

We acquired this receiver "new in box", unissued, clean and complete,
with a test report dated "3/2/44" - a good start! Unfortunately, the
"new" Bendix dynamotor type DA-TA is seized up (tried it on a variable
low voltage DC, the current spiked up, no motion, switched off fast!)
It last ran in 1944 and for the last 65 years has been in storage. My
guess is the bearing grease has congealed and/or the brushes have
stuck firmly on the commutators. I just hope there is no rust between
the armature and field core. Is there any expertise, or any
instructions, out there for servicing this unit? If so, I would
really appreciate a few pointers from knowlegeable people. BTW, we'll
be running the radio off external power supplies (app. 250 VDC B+ and
28 VDC for the heaters) but we'd still like the (disconnected)
dynamotor to be servicable.

Another thing: the band switch is motor driven. I've not checked this
as we have not yet wired in the tuning unit, but it crossed my mind
that this motor, too, could be seized. Can the band switch be
operated manually (case open, of course), or, if motor OK, by a simple
external switch (I can probably figure the latter out.)

Many thanks for all replies.
Cheers,
Roger
PS. Feel free to email me at "analogdino at(ta-boy) rogers dot(ty-as-
they) com(e)", suitably decoded. Visible address is fake for anti-
spam. Thanks again.