6SN7 tube GTA vrs GTB


I would like to know the difference between the designation GTA and GTB.

Thanks
fordmod
OK. I will check that out. Funny, I will be in Indy in two weeks for work....
Too bad you can't bring your system(and listening room) with you. Given so many variables- Tubes that sound perfectly natural in my system, could sound much less so in yours. I've a feeling you'll like the Sylvanias and TungSols though, and the VT-231 will be a less expensive foretaste.
how are the Sylvania 6SN7WGT that good? I was told they are GREAT. Is this true? The "best" 6sn7? How do they compare to the RCA GTB's?

Thanks,
The "best" are the 40's TungSol JAN CTL/6SN7GT round plate, bottom getter and Sylvania JAN CHS/6SN7W(tall bottle, metal or plastic base)- hands down(that's IF you like transparency, dynamics, extension on the top and bottom without glare of tubbiness, imaging, microdynamics, depth and width of sound stage). The price that these tubes command reflects the quality of their sound, and the number of persons that appreciate it(very high demand). Of course: Some enjoy a more colored(warmer, sweeter, tubier, etc.) sound, and may prefer other tubes. The 6SN7WGT is a good tube but not nearly "the best"(though probably the best most have tried). The RCA's have a "warmer/fuller" presentation in most equipment.