[Milsurplus] Original TBX radio

[Robert Downs]

Ray,

 

I offer a reprint of the TBX-5 manual.  Go to wa5cab.com.  There is very
little difference from TBX through TBX-6.

 

TBX-7 was to be the same as TBX-8 (no change to the transmitter but the
receiver is nearly the same as in the BC-1306 (7-pin miniature tubes).  The
order for TBX-7 was apparently  cancelled.  The only place that I have seen
it mentioned is in the manual for the 12VDC vibrator power supply.

 

If you plan to run the receiver filaments off of parallel D-cells, don't use
DuraCell.  Two or more in parallel get very hot very quickly.

 

Robert Downs

 

From: milsurplus-bounces at mailman.qth.net
[mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of Ray Fantini
Sent: Friday, February 24, 2023 09:03
To: milsurplus at mailman.qth.net; mrca at mailman.qth.net; MMRCG at groups.io
Subject: [Milsurplus] Original TBX radio

 

I will soon be picking up a new to me Navy TBX transceiver. I did have a
TBX-6 about twenty years back that I had operated at Dayton and a couple
other events but traded that away years ago. Problem was way back then used
all printed material so don't know how much of the old paperwork I will be
able to locate

The new radio is a 1939 straight TBX (NOs-65704 16 Mar 1939) CG-43005 That's
not a TBX-8, never wanted an eight and always liked the "Old School" design
of the radios before that was interduce. I remember that the six that I had
before used all 34 tubes along with something like a 1C4 in the receiver and
the entire receiver only drew around fifteen or twenty mills at 90 volts
during normal operation and was always amazed that any receiver can operate
with that low a demand. Also, the non-eight all just have one tube in the
transmitter that's suppressor modulated, think it was an 837

The new plan is to build up a battery pack with a couple D cells and a stack
of nine-volt cells for supplying the 90, 1.5 and bias needed by the receiver
and get that working first and then throw something together for the
transmitter for the five hundred volts required for that.

The problem will be that I am now in need of a couple things, first the
schematic for a TBX, any TBX up to the seven series will do but the
schematic for the eight is of little to no use, have that anyway and I will
need the correct name and identifier for the two power plugs on the front of
the radio. Think they are all the same on all the TBX family.  I now have to
come up with another set of plugs for the radio.

Somehow over the years this radio has lost its case, think that may be a
huge issue in the future but for now not a big problem, kind of like the way
they look when you operate them outside their case. I have an RCA AVR
receiver and a old command set transmitter that I intend to be running for
the WW2 3885 AM Net out in Dayton this year and the old RCA looks way cool
with all its aluminum cans and tube shields exposed.

 

Ray F/KA3EKH

 

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