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2 X 837 TUBE. NEW OLD STOCK.
BRAND: -. 1950s BRITISH PRODUCTION.
BLACK PLATES, MATCHED PAIR.
THE TUBE ON THE LEFT HAS AN INVERTED CUP GETTER, THE ONE ON THE RIGHT HAS A FLAT GETTER.
TESTED IN ROEHRENTEST TUBE TESTER:
96% 47.25mA EMISSION (EM) 4.37mA/V TRANSCONDUCTANCE (GM)
92% 45.08mA EMISSION (EM) 4.13mA/V TRANSCONDUCTANCE (GM)