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4 X ECC83 / 12AX7 TUBE. USED.
BRAND: TELEFUNKEN. 1960s PRODUCTION.
GREY SMOOTH PLATES, HALO GETTER, QUAD.
TESTED IN ROEHRENTEST TUBE TESTER:
75/84% 0.897/1.002mA EMISSION (EM) 1.51/1.53mA/V TRANSCONDUCTANCE (GM)
65/122% 0.777/1.467mA EMISSION (EM) 1.34/1.81mA/V TRANSCONDUCTANCE (GM)
77/70% 0.919/0.844mA EMISSION (EM) 1.53/1.48mA/V TRANSCONDUCTANCE (GM)
72/139% 0.867/1.669mA EMISSION (EM) 1.5/1.98mA/V TRANSCONDUCTANCE (GM)
CH164U1
