From the same batch of Item 909A except these tubes have imperfect test scores. Tubes either test low in one or both of the triodes.

Brand New, MINT NOS NIB Rare May-1973 production Tungsram Industrial Grade ECC82 12AU7 with IMPERFECT TEST SCORES. Each tube has individual RED Serial Number and Serialized Certificate. Made in Hungary. All tubes from the same Date and Batch 3M.

Industrial grade tubes were subject to rigorous test and burn in process. These tubes were produced in limited quantities (between 5000-10000 tubes according to Zeitmann from Hungary). Tungsram ECC82 tubes are well liked by many Audiophiles.

Tested and matched on Hickok 752, just recently calibrated and modified by Hickok expert to all Solid State to eliminate drift.

Price = $25 per tube.