The TCS radio set is a complete radio transmitting and receiving installation and is designed for use in portable and mobile services. The equipment is suitable for installation in Trucks, ambulances, motor cars, tanks, motor boats, and in other services where severe vibration and shock may be encountered.
That paragraph came out of the manual for the TCS. The transmitter employs an oscillator-buffer-amplifier circuit with eather crystal control or master oscillator control. It uses four 1625 tubes, two in the RF final and two in the modulator, for CW use, both 1625's are used, but for AM operation only one 1625 is used by turning off the filament to the second tube. The transmitter runs about 40 watts output on CW and about 20 watts output on AM. It was designed to use a carbon Mic of about 100 ohms resistance, but requires a lot of audio to fully modulate the carrier. The reason for this as there isn't any pre-amplification of the audio before it is feed to the grid transformer of the two 1625's in the modulator. Electric Radio has an article in the January 1992 page 33 on a Mic amplifier that can be used with the TCS transmitter.
Both the Receiver and the transmitter cover 1.5 to 12 mc. The receiver is a super-heterodyne with one stage of r-f amplification and two stages of i-f amplification. It also can be crystal controlled or continually tuned.
There was a multitude of power supplies that were designed for this radio set. Every thing from 12, 24, 32vdc and ac supplies for both 110, and 220vac.
The radio set that I have is the TCS-12 set. I have a 110vac supply that came with the radio, and I am looking for a 12, 24vdc dynamotor supply as well. The transmitter runs more power output than what the manual says as the plate voltage is higher, about 60 watts output on CW and about 40 watts on AM. Using the Mic preamp the transmitter sounds very good with plenty of audio. The receiver is very sensitive on CW and sounds good on AM, but is very broad and prone to overloading on strong adjacent signals. This is a fun radio to use on CW with the full break-in capability.
I don't have any good photos of my pair yet. The line drawing is from the manual.