Sensibly equivalent¶ to:
815 QV04-20 VT-287
The design of this VHF transmitting double beam tetrode follows the American pattern of two separate valves within the envelope.
Originally the QQV04-20 was known as the QV04-20 and Mullard changed the nomenclature in December 1948.
The later developments from Mullard were of the newer type with a common cathode. See the QQV03-20.
The wide glass tube envelope is 48 mm in diameter and, excluding the IO base pins, is 94 mm tall.
References: 1951 Datasheet, 4065 & 1040. Type QQV04-20 was first introduced in 1948.
Absolute Maximum Operating Conditions¶
PDF scanned from an original document held by the museum
Updated November 09, 2017. shape:wide.glass.tube construction:pinch type:double.beam.tetrode age:1940.1950 base:io heater:6.3v pins:8 pin:1.h pin:2.g1(2) pin:3.k.bp.s pin:4.g2 pin:5.hct pin:6.ic pin:7.g1(1) pin:8.h pin:tc.a(1) pin:tc.a(2)