Sensibly equivalent¶ to:
The MX40 is an 1934 heptode frequency changer or mixer. This example has the grey zinc paint metalising. The oscillator voltage was designed to be 10.0 V peak to peak.
The zinc paint carries the Marconi branding.
The balloon envelope is 44 mm in diameter and, excluding the B5 base pins, is 112 mm tall.
References: Data-sheet, 1040 & 1043. Type MX40 was first introduced in 1934.
Absolute Maximum Operating Conditions¶
Updated December27, 2014. shape:balloon construction:pinch type:heptode age:1930.1940 base:b7 heater:4.0v pins:7 pin:1.g2 pin:2.g1 pin:3.g3.g5 pin:4.h pin:5.h pin:6.m.k pin:7.a pin:tc.g4