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The literature gives a Mullard Pen4VA on a B7 base but not the Pen4BA and we suspect incorrect labelling in the original display.
This valve will be an audio output pentode. The Pen/4VA had an output of 3.8 Watts at 10% distortion.
The classic envelope is 45 mm in diameter and, excluding the B7 base pins, is 113 mm tall.
This exhibit was last updated on 25 January 2003
This valve will be an audio output pentode. The Pen/4VA had an output of 3.8 Watts at 10% distortion.
The classic envelope is 45 mm in diameter and, excluding the B7 base pins, is 113 mm tall.
This exhibit was last updated on 25 January 2003
This exhibit was last updated on 25 January 2003
This exhibit was last updated on 25 January 2003 |