The VPU1 is a variable μ RF pentode introduced in 1937.
The VPU1 was used by Ekco in their 1937 AD38 radio. Other valves in the line-up were SP13C straight HF pentode, Pen36C audio output pentode and UR1C half wave rectifier. This was an AC/DC straight or TRF broadcast receiver. The AD37 receiver used a VP13C rather than the VPU1. The VP13C is an HF variable μ pentode.
The classic envelope is 41 mm in diameter, and excluding the B7 base pins is 108 mm tall.
References: 1043. Type VPU1 was first introduced in 1937.
Absolute Maximum Operating Conditions¶
Updated December14, 2012.