A quantity of two EF86 high gain pentodes manufactured by
Mullard. Fairly clear chalky white print, mesh anodes. These valves were tested sometime in the
past on a two panel AVO meter for mutual conductance and the following
measurements were recorded; 2.1mA/V for the first valve, and 2.4mA/V for the second. The AVO manual recommends a figure of 1.8mA/V for a good valve.
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Thanks for looking.