Sensibly equivalent¶ to:
We know that ATP denotes an Army Transmitting Pentode and that it dates from the late 1930s. It was still in operational use in the early 1940s as it was given a CV designation under the common valve initiative. The ATP7 is a selected Mazda V226 where the selection is that the mutual conductance is a minimum of 3.0.
Internally the three wire grids can be seen within the oval sheet metal anode. The valve is directly heated, possibly thoriated tungsten, the wire passes through the electrodes four times.
The type designation is printed on a band of external metalisation.
The classic envelope is 44 mm in diameter and, excluding the B7 base pins, is 124 mm tall.
References: 3002 & tubecollector.org.
Absolute Maximum Operating Conditions¶
Updated December14, 2012. shape:classic construction:pinch type:pentode age:1930.1940 base:b7 heater:6.0v pins:7 pin:1.- pin:2.g1 pin:3.g3 pin:4.f pin:5.f pin:6.- pin:7.g2 pin:tc.a