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5 X ECL80 TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: TELEFUNKEN. 1950s SIEMENS AND HALSKE PRODUCTION.
GREY PLATES, HALO GETTER, 3 MICA, MATCHED QUINTET.
TESTED IN FUNKE W19S TUBE TESTER:
TRIODE MINIMUM GOOD EMISSION = 60% = 4.2mA
PENTODE MINIMUM GOOD EMISSION = 60% = 14mA
7.5/23mA EMISSION (EM)
7/23mA EMISSION (EM)
7.4/25mA EMISSION (EM)
7.6mA EMISSION (EM)
7mA EMISSION (EM)
CB406U1
