All tubes are tested on a professionally calibrated Triplett 3444.
These test as NOS. Mullard (Blackburn) ECC88 -1967/January - Matching Date Codes - $40/pair Free Shipping Tube #1: 12.5ma @ 11,000gm and 12ma @ 11,200gm
Date Code B7A5 – 1967 January Tube #2 10ma @ 10,000gm and 10ma @ 10,500gm
Date Code B7A5 – 1967 January 13,000gm is the standard for a new 6DJ8, and 8400gm is the replace number on a Triplett 3444. No Gas or Shorts. 5 Day Return Policy - I endeavor to thoroughly test your tubes before shipment to ensure that I represent them accurately. If they do not perform as expected in your system - microphonics or noise for example, then you may return them for a full refund. Buyer pays return insured shipping. The 5 Day Return is not intended to provide a Buy-Try-And-Return method by which a Buyer can "tube roll" and return them if they do not produce a subjectively pleasing result.
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