[Amps] Anyone heard of a Delcon T210 amp?

[F. Veitch]

This is an older amplifier, 3.5 to 30 MHz using 3 by 4CX-250Bs in parallel.
Nicely built with vacuum variables for Tune and Load.  Matching external
Power Supply provides 2300 VDC at 500 mA.  Has anyone ever heard of this
thing or can they provide any information on it?  It almost looks like it
was mil-spec construction from the mid 60s.

Any comments appreciated 
Fletch 
K3JYD 
FM-18pl