I sold my OTL amp and now no longer have a need for these wonderful power tubes. I have 5 RCA and 3 Chatham available. All have been tested in my calibrated and refurbished Jackson 648-S tester where 70% is minimum good and 100% is considered new. Test results are listed as (X/Y) corresponding to (Triode 1/Triode 2). New is 100/100. They have also been play tested on my amp.

RCA pair #1 - Silver lettering, clear tops, single bottom "D" getter, no lower mica shield (rare). One tube has a slightly loose base. Easy fix if you choose. Tube 1 tests 104/104 and tube 2 tests 109/109. Comes with RCA consumer-style boxes. $65 pair shipped or $40 shipped as singles.

RCA pair #2 - Orange lettering, military designation, top getter. Tube 1 is 98/96, tube 2 is 101/97. Original military white boxes from 1961 included. $75 pair shipped or $45 shipped as singles.

Chatham single - White lettering, clear top, copper rods. Tests 105/106. The best 6AS7G next to the GEC in my opinion. $75 shipped.

Chatham pair - White lettering, clear top, copper rods. Tube 1 tests 102/103, tube 2 tests 104/106. The best 6AS7G next to the GEC in my opinion. SOLD