A quantity of two EF86 high gain pentodes manufactured by
Mullard. Fairly clear white print, mesh anodes, same serial prefix 9r2 B1. These valves were tested sometime in the
past on a two panel AVO meter for mutual conductance and the following
measurements were recorded; 2.2mA/V for the first valve, and 1.2mA/V for the second valve. The AVO manual recommends a figure of 1.8mA/V for a good valve. As found in plain cartons.
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Thanks for looking.