Sensibly equivalent¶ to:
The Pen220A is very different in shape and design from the Pen220 and this valve was probably made by Cossor.
The Pen220A is a battery output pentode from the 1930s and an uprated Pen220 with twice the anode current and an output of one Watt.
Originally introduced on a B4 base with side terminal in 1931, the B5 based version followed in 1933.
The anode load impedance is given as 6,000 Ohms.
The classic envelope is 42 mm in diameter and, excluding the B5 base pins, is 95 mm tall.
References: 1040 & 1043. Type Pen220A was first introduced in 1931. See also 1931 adverts.
Absolute Maximum Operating Conditions¶
Updated June 11, 2022.