A half-wave vacuum rectifier assigned a military designation or "pattern" number by the British Navy. This type of tube was also referred to as a CV1266 or a NU13A ...
A 4-pin plastic base (banana pins) with top contact, domed envelope. Stamped on envelope: "Made & Patented in England U17 / [Air Ministry logo] / A. M. / 10E/19". A ...
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