One matched pair of  high prestige USN-CHS-5963 tubes by Sylvania, in gold  lettering.

A good substitute for 12AU7 for use in the front end of an amp, due to simulating characteristics.

Grey plate, slant square getter..

Test Ratings:  better than 90/90 to 95/95 on my Jackson 648s tester, minimum is 70, new tubes at about 90-95.

SHIPPING: Shipping to USA and Canada with tracking. The shipping rates have been continuing rising during the recent years. If you pay slightly more than the actual rate, I will refund you accordingly. For all other international countries, shipping by airmail but without tracking. 

Please pay in 3 days. Combined shipping is welcome. If you have paid for individual items and have surplus shipping fee paid for, I will refund you immediately when I send out the combined parcel.