McVitie Weston valve collection, Castilla valve, type A.T.-2
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Castilla valve, type A.T.-2, double-ended cylindrical glass envelope with 3-pin cap at one end and anode cap at other, electrodes mounted on four silica rods, length 17in overall, diam 3.5in overall, (RMW/J7 - McVitie Weston number), by Establecimientos Castilla, S.A.E..
