Twin Tetrode Type C180 Base: 7 pin, Chelmsford, England, 1954.
Parallel Vinput 6.3 volts / Iinput 1.6 Ampere
Transconductance = 3.5 A / V (Ia=30mA)
Amplifier and Oscillator Max Va = 750v
Ia = 90mA
Amplifier Only Max Va = 600v
Ia = 75mA
Half-wave rectifier tube.
Replaced the PY32. Has higher peak current and surge ratings permitting better smoothing, by enabling higher values of filter capacitance." Taken from…