Sensibly equivalent¶ to:
The A50A branded as Ever Ready was made for them by Mullard and is a Mullard Type SP4. When originally introduced it was fitted with a B5 base cap.
The A50A is an RF pentode.
The exhibit is new and was donated in its original box. It was expensive as the box is priced at 20/7 including purchase tax.
The classic envelope is 47 mm in diameter and, excluding the B7 base pins, is 125 mm tall.
References: Data-sheet 1024 & 1043. Type A50A was first introduced in 1935.
Absolute Maximum Operating Conditions¶
Thanks to Andy Cowley for supplying the above PDF datasheet.
Updated July 30, 2015. shape:classic construction:pinch type:pentode age:1930.1940 base:b7 pins:7 pin:1.m pin:2.g1 pin:3.g3 pin:4.h pin:5.h pin:6.k pin:7.g2 pin:tc.a