Quite Rare 1957 Mullard 12AU7 ECC82 17mm plates, Goal Post Square Getter, basically looks like an MC1. Blackburn plant, United Kingdom, nice silkscreen for a 67 year old tube! Code: K61 B7L preamplifier vacuum tube. Non original box. Hickok tested very nice and balanced tight. 🎶

Hickok NOS min. Value 2200 µΩ

Actual test values-

t1: 2250 µΩ, t2: 2200 µΩ

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