Dead quiet when idle, and stable during high output amplification. Both tubes test very strong, slightly above NOS. NOS = 3,200. 6SU7-GTY, brown base and black glass tubes are a premium, ruggedized, tightly specified version of 6SL7-GT tubes.
Dead quiet when idle, and stable during high output amplification. Both tubes test very strong, slightly above NOS. NOS = 3,200. 6SU7-GTY, brown base and black glass tubes are a premium, ruggedized, tightly specified version of 6SL7-GT tubes.