2 x 6sn7gtb Hytron Tubes. Tested on Enhanced Triplet E3444 Laboratory Tester prepared by Paul Hart of Roswell Ga. Tubes may also be operated under the test conditions for extended periods to be sure that it is stable.
FOR SALE,STRONG MATCHED PAIR OF GE USN-5Y3WGTB 6087 TUBES. DATE CODES, 60-43 (1960 WEEK 43) AND 61-52 (1961 WEEK 52). THESE TUBES HAVE BLACK PLATES AND SQUARE GETTERS. TUBE #1 TESTED 59/59. TUBE #2 TESTED 59/59.
Type 6L6GA vacuum tube. One tube,circa1953, U.S.A.made by Sylvania for Hytron. 6L6 / GA / K1M. Hickok TV-7B/U is a mutual conductance (Gm) type tube tester. Acid etched designation (Sylvania's emblem) .
Tv7 tested TUBES. All our tubes have been tested for. It can be wiped off and destroyed VERY easily.