The TT12 is a transmitting beam tetrode for use in the low VHF region up to 90 MHz at full ratings and at reduced power up to 130 MHz. The drive power needed to drive to full power of 40 Watts out is 0.4 Watts. The anode dissipation is quoted as 20 Watts. Given the low control grid voltage, dissipation and output power, this valve was designed to operate as a Class C amplifier into a tuned anode load.
The anode formed in two halves and with side flanges for extra cooling and attaching to the supports.
The other side of the anode with getter deposits on the envelope.
The EMI branding of an M-OV product.
The B9G base.
The wide glass tube envelope is 39 mm in diameter, and excluding the B9G base pins is 89 mm tall.