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4 X RS289 TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: TELEFUNKEN
GREY PLATES, FLAT GETTER, MATCHED QUAD
TESTED IN FUNKE W20 TUBE TESTER
MINIMUM: 22mA = 60% = GOOD
48.9mA EMISSION (EM) 49.2mA EMISSION (EM) 48.3mA EMISSION (EM) 48.6mA EMISSION (EM)