Sensibly equivalent¶ to:
The ATP5 is a small transmitting pentode made to a late 1930s British Army specification for use in portable field radios running from relatively light batteries. It is probable that this valve is intended to operate as the final RF amplifier of a very simple type of transmitter in which a small crystal (or hand-tuned) RF oscillator drives G1 and where voice modulation from a carbon-type microphone is applied to G3.
That the sample shown was made by Mazda is evident from the characteristic shape of the envelope as well as by the marking.
This valve has no common civilian equivalent.
The classic envelope is 38 mm in diameter and, excluding the B7 base pins, is 114 mm tall.
References: Private communication & 3002.
Absolute Maximum Operating Conditions¶
Updated December14, 2012.