| 7-Vintage Tubes, 6SN7 GTB, 4-chrome top, Tested |
| Pair Vintage Raytheon Black Plate 6SN7 GTB Preamp Tubes |
| 6SN7/gtb Sylvania Vaccum Tube Test low (63-66) |
| GE 6SN7GTB Vacuum Tube 6SN7 GTB Audio Radio Ham |
| Identical Pair of CBS 6SN7 GTB Black Plate Tubes |
| +++++ Tung-Sol 6SN7 GTB BROWN BASE Tube 3223 6320 +++++ |
| 4 Used 6SN7 GTB Test Well |
| Sylvania Chrome Top 6SN7-GTB Tubes 6SN7GTB |
| 4 X 6SN7 GTB Close Match EXCELLENT TESTED TUBES |
| 6SN7 GTB Raytheon Quad T&M NR |
| Pair Vintage Raytheon Black Plate 6SN7 GTB Preamp Tubes |
| 4 x 6SN7 gtb/a G.E. Tubes |
| 2 Tung-Sol 6SN7 GTB Tubes |
| 6SN7 GTB TUBES, TESTED, SATISFACTION GUARANTEED |
| 10- RCA 6SN7 GT GTB Tubes Black Plates |
| R10 Four NOS RCA Coin Base 6SN7 GTB Tubes |
| R4 Two NOS RCA Coin Base 6SN7 GTB Tubes |
| Match Pair G.E. 6SN7-GTB Ring Gtr-BlkTall Bt-Tubes |
| Lot Of 3 Vintage Matched GE 6SN7 2 GTB & 1 GTA |
| Pair GE 6sn7gtb 6sn7 gtb tubes, tested excellent |
| 6SN7 GTB RCA Black Plate T&M NR 20 Lot |
| 6SN7 GTB Pair RCA T&M NR |
| 6SN7 GTB RCA Black Plate T&M NR Quad |
| 6SN7 GTB RCA / Baldwin Black Plate T&M NR |
| Pair RCA 6sn7gtb 6sn7 gtb tubes, tested excellent |
| Matched Quad Sylvania Chrome Top 6SN7-GTB Tubes 6SN7GTB |
| SYLVANIA 6SN7 GTB VT231 VINTAGE MATCHED PAIR TUBES NOS |
| Vacuum Tube, Sylvania, 6SN7 GTB, Chrome, Excellent - |
| Vacuum Tubes, Two, Sylvania 6SN7 GTB, Chrome - |