Mullard 12AT7/ECC81 Made in 1956 with Angled Square Getter and Same Date Code. ULTRA RARE PAIR MULLARD MITCHAM FACTORY 1956 WELDED WING PLATE 12AT7 TUBE. THE WELDED PLATE VERSION WAS ONLY MADE FOR A FEW MONTHS IN 1956. SPOT WELDED WING PLATES SQUARE GETTER COPPER POSTS. ULTRA RARE! Date Code: 650 R6G Made in July 1956. Fully tested by calibrated Hickok 539C tubes tester with no shorts, leakage or gas. Measurement: 4400/5250 where minimum good value is 2500 Test very strong and tightly balanced. Tested in my preamplifier to make sure working as intended with no issues at all. I will gladly combine shipping.
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