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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 with an oxide coated filament, the wire passes through the electrodes four times.

The type designation is printed on a band of external metallisation.

The classic envelope is 44 mm in diameter and, excluding the B7 base pins, is 124 mm tall.

References: ³⁰⁰² & tubecollector.org.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.