For sale: One pair of Tung-Sol 12AU7 tubes with blackened glass. Both tubes test strong and close at 106/107 and 108/108 with no shorts or emissions on my B&K 707 mutual conductance tester. The minimum 'good' reading on this tester is 66.
Both tubes have the same production date of 3221-35 and both have good print on them. These were tested for microphonics and are decent sounding. As long as the tubes are not subjected to excessive vibration they will not affect the sound at all. Generally, TS black glass 12AU7s are notorious at being very microphonic, but these are some of the better ones that I had hoarded for myself.
I pack very well. Check out my feedback on A-Gon. Shipping to the US is $5.00. If you are outside the US please send an email for mailing costs. I accept checks, money orders, and PayPal for payment. Please email if you have any questions.