You are correct sir! If you get a copy of Morgan Jone's book "Valve Amplifiers", 3rd edition, you will see extensive analysis and comments including distortion measurements on 6SN7's and the 6J5 (same size bottle but only half as filling).
I only found this tidbit of knowledge out recently during a visit to my establishment by the author Mr. Jones in the flesh. He was perusing through my audio valves inventory and saw some NIB 6SN7GTB Hit-Rays. He specifically suggested that I not waste them wherever I need merely a 6SN7 and explained why. I had previously assumed (mistakenly) that ALL 6SN7's had the 450 volt plate rating.
I only found this tidbit of knowledge out recently during a visit to my establishment by the author Mr. Jones in the flesh. He was perusing through my audio valves inventory and saw some NIB 6SN7GTB Hit-Rays. He specifically suggested that I not waste them wherever I need merely a 6SN7 and explained why. I had previously assumed (mistakenly) that ALL 6SN7's had the 450 volt plate rating.
Hi there!
Rite.
The only difference between GT, GTA and GTB is controlled heater characteristic (for series-connected heaters in ratios and televisions). It has absolutely nothing to do with the sound.
Rite.
6SN7 & GT = 300V, GTA & GTB = 450V
According to the datasheets at Frank's Electron tube Pages for the 6SN7, 6SN7GT, and 6SN7GTA and GTB, the 6SN7 and GT have a max plate voltage of 300V, while the GTA and GTB have a max of 450V. The GTB differs from the GTA in that the former has a controlled heater warm-up time.
According to the datasheets at Frank's Electron tube Pages for the 6SN7, 6SN7GT, and 6SN7GTA and GTB, the 6SN7 and GT have a max plate voltage of 300V, while the GTA and GTB have a max of 450V. The GTB differs from the GTA in that the former has a controlled heater warm-up time.
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