The VR17 was specified by the Air Ministry for the RAF. It is a directly heated battery triode and came in a Cossor box.
The filament rating suggests a thoriated tungsten dull-emitter valve.
The gettering completely covers the envelope, however, under strong light the shadow of the anode can be seen. The anode is a vertical rectangular box.
The Crown and AM of the UK Air Ministry.
The wide glass tube envelope is 29 mm in diameter and, excluding the B4 base pins, is 78 mm tall.
Reference: 3002. Type VR17 was first introduced in 1925.
Absolute Maximum Operating Conditions¶
Updated May 16, 2021.