For your kind consideration is this vintage Mullard GZ34 / 5AR4 rectifier tube made in Great Britain at the Blackburn factory in 1961. It has dual O getters and a code of f31 B1D. The tube is in great condition and reads strong.
Tested on our calibrated Hickok 533A and reads Good for both sides on the Good/Bad scale and evenly balanced at 2700 & 2700.
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