The TW2-120 was a high power crystal controlled 2m AM/CW transmitter with an input power of 120w AM and 150w CW. It used a QQVO3-10 to drive a QQVO6-40 in the p.a. stage (which used silver plated tuned lines) and was modulated by a pair of KT77s in class AB2 coupled to the p.a. by a Woden type UM2 transformer.
A separate power supply was needed to provide the HT and heater supplies via the connections on the rear of the transmitter. The power requirements were 600v at 300-400mA, 250v at 100ma, -15v bias and 6.3v at 8 amps.
A Belling Lee socket on the rear was used for the microphone (crystal mic) connection. A switch on the front panel allowed up to 3 different crystals (6MHz, FT243 mounted inside) to be selected. The antenna socket was mounted on the front panel (Belling Lee, SO-239 or BNC).