Sensibly equivalent¶ to:
11E16 5894 829 AX9903 RS1009 SRS4451 TD25 TT25
The QQE06-40, from Mullard's owners Philips, is an earlier form of the European pattern double tetrode. It is taller and there are no obvious sign of the internal neutralising capacitors. The QQV06-40A from Mullard was a standard valve for VHF transmitters of medium power in the 1960's.
Mullard do not give a value for the 'E' in their naming convention for transmitting valves but we have another valve with the 'E' and that is marked Mullard.
The wide glass tube envelope is 43 mm in diameter and, excluding the B7A base pins, is 87 mm tall.
References: Datasheet & 3002. Type QQE06-40 was first introduced in 1957.
Absolute Maximum Operating Conditions¶
Updated February 15, 2013. shape:wide.glass.tube construction:all.glass type:double.beam.tetrode age:1950.1960 base:b7a heater:6.3v pins:7 pin:1.h pin:2.g1(2) pin:3.g2 pin:4.k.bp pin:5.hct pin:6.g1 pin:7.h pin:tc.a pin:tc.a(2)