The Tungsram HP4115 is a vari-μ RF pentode that was made with both B5 and B7 base caps. The valve has a short grid base and the control grid bias range is -1.5 to -12 Volts.
The B5 base pins.
Thanks to Mark Mallison for sending the image.
The classic envelope is 50 mm in diameter, and excluding the B5 base pins is 141 mm tall.
Reference: 1043. Type HP4115 was first introduced in 1935.
Absolute Maximum Operating Conditions¶
Updated October 13, 2019. shape:classic construction:pinch type:pentode age:1930.1940 base:b5 heater:4.0v pins:5 pin:1.g2 pin:2.g1 pin:3.h pin:4.h pin:5.k.g3 pin:tc.a