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.
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