Mullard 12au7 Mitcham Ecc82 Long Plate K61 Perfect Match Pair Nos+ Vintage 1959

Hello, and thank you for viewing my listing(s)... Most tubes have not only been tested on one of my many reliable tube testers, but also in audio applications... 99.99% of the time the issue can be resolved without starting a RETURN PROCESS OR OPENING A CASE...

You always have the option of doing that if we cannot come to a satisfactory conclusion on our own... Most tube issues are pin to socket contact issues which means that there is no real problem to begin with... This does not necessarily mean that the tube is new, but tests at or above new tube typical minimums... Tester: recently calibrated Hickok 600A... Average for new 12AU7's is 2200mmhos and a minimum good of 1400mmhos..

Average NOS test results for a 12AU7 on the Orange tester is 8-10... MULLARD 12AU7 MITCHAM ECC82 LONG PLATE K61 PERFECT MATCH PAIR NOS+ VINTAGE 1959... This listing is for a spectacular condition, NOS NIB pair of 1959 Mullard Mitcham 12AU7/ECC82...

They have close matched Mitcham factory/date codes of K61 R9E and R9I with long plates, halo getters and branded for Rogers Canada... They have tightly matched and balanced triodes, test well in the NOS range, and in my monoblock preamp stage performed flawlessly... Tube 1...2525/2600 and 9/10. Tube 2...2600/2500 and 10/11.