Sensibly equivalent¶ to:
The MSP41 is a 1936 improved version of the 1933 MSP4 amplifier pentode. The total cathode current is given as 12 mA whereas the MSP4 cathode current is given as 4.3 mA.
The application was as a TV RF amplifier. This improved version was marketed but had few takers since the real requirement was for high-slope types such as the KTZ41 (which had a nominal gm of 12.0!).
Thanks to Mark from Vintage-parts for sending these images.
The classic envelope is 42 mm in diameter and, excluding the B7 base pins, is 121 mm tall.
References: Datasheet, private communication & 1043. Type MSP41 was first introduced in 1936.
Absolute Maximum Operating Conditions¶
Updated February 27, 2017.