Model 6SN7GTB. Manufacture Date 1957-1958 — Sylvania plant, tube manufactured 1957 or 1958. Condition Tested as NOS. ALL TUBE AUDIO. Minimum Good Value: 50/50.
Model 6SN7GTB. Manufacture Date 1957-1958 — Sylvania plant, tube manufactured 1957 or 1958. Condition Tested as NOS. ALL TUBE AUDIO. Minimum Good Value: 50/50.