Matched Pair Mullard 12AT7/ECC81 O-Getter Copper Post Made in England. One tube has yellow printing. Date Code: Tk3 B3G4 & Tk3 B4I1 Made in July 1963 & September 1964 in Blackburn England -close dates- Fully tested by calibrated Hickok 539C tube tester with no shorts, leakage or gas. Measurement: 3300/3700 3500/4000 where minimum good value is 2500 Strong pair! Tested in my preamplifier to make sure working as intended with no issues. |
I will gladly combine shipping upon request. |
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