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1 X EF91 / 6AM6 / CV138 WESTINGHOUSE TUBE. NEW OLD STOCK.
BRAND: WESTINGHOUSE
GREY PLATES, HALO GETTER, COPPER RODS.
TESTED IN FUNKE W20 TUBE TESTER:
MINIMUM GOOD EMISSION = 60% = 4mA
10mA (150%) EMISSION (EM)