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2 X ECC83 TUBE. USED.
BRAND: SIEMENS. 1960s SIEMENS UND HALSKE PRODUCTION.
GREY PLATES, HALO GETTER, MATCHED PAIR.
TESTED IN ROEHRENTEST TUBE TESTER:
60/72% 0.72/0.86mA EMISSION (EM)
69/74% 0.83/0.88mA EMISSION (EM)