Pair of very nice, early 1960’s Mullard Blackburn factory 12AX7 tubes. Tested strong and quiet on multiple testers. Quiet to ear - no microphonics!  These tubes test LOW USE or NOS performance on all sides, see exhibit A.  Dynamic emissions for easy reference -- all sides read at or above 115%.   They have been fully GM matched @ fixed 250V. Played music -- working great -- tubes are quiet and strong. A really beautiful pair of early 15mm Blackburn's! 

Matched construction, authentic, thick smokey 1960s style Mullard flashing, cross seam bottles -- and bright flash at power on!  From estate, stored for many years.

See our 100% happy customers on all vintage tubes sold. 

Matched well for GM mutual conductance and current draw on all sides.   See exhibits B & C. 

These are the real McCoy. They will sell quickly, as always. Probably the nicest set of 15mm Mullards on eBay currently. Buy Now, to avoid a bidder's war.

FAST SHIPPING, DOUBLE BOXED w/tracking # and NO DOA, happiness guaranteed.

Genuine VINTAGE 1950's & 1960s Mullards (like these) are amongst the sweetest and detailed sounding brand of vintage 12Ax7 / ECC83. They exceed all expectations in musicality, sheer detail and amazingly balanced tone, and rich timbre! 

 Gourgeous Mullards. The flashing is smokey & beautiful, thick & shinny. The pins are straight. The ink logo is rubbed, but both have 100% maker's marks, & model letters. 

All units are matched construction and have close or matched factory codes (see exhibit D).

These are strong tubes .. just checked in amp and sounding wonderful.  

Your happiness is assured. Guaranteed NO DOA.