One matched pair of 6SN7GTB tubes by RCA, one with a special inhouse number (see picture).
Wide black plate, bottom square getter.
Test Ratings: 100/105 and 110/110 on my Jackson 648s tester, minimum is 70, new tubes about 105.
Note: Shipping to Europe and Asian countries cost almost double for the second pair in combined shipping, please contact Seller for actual shipping cost before you buy.
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.