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In Reply to: RE: 6sn7 GTA or GTB ??? posted by em on October 20, 2009 at 14:20:25
GTA:
Max Plate (watts)=5.0; Plate Imax=9.0; Rp=7700 Gm=2600
GTB:
7.5 ; 10; 6,700; 3000
DIY, all the time!
Not quite. For both the GTA and GTB, the max plate dissipation according to the RCA manual is 5 watts for each plate, 7.5 watts for both plates operated at the same time. In fact the RCA manual lists the specs for the 6SN7GTB and 12SN7GTA (12 volt version of the 6SN7GTA) in the same section.The Rp = 6700 ohms and Gm = 3000 if you operate either at 90 volts plate voltage and 10 mA current, the Rp = 7700 ohms and Gm = 2600 if you operate either at 250 volts plate voltage and 9 mA current.
From Ludwell Sibley's "Tube Lore", "'GTB' is controlled warm-up version of 'GTA' for series-string receivers."
Edits: 10/20/09
Nt
DIY, all the time!
your post was suggesting that there were differences in the electrical characteristics between the two, when they are the same.
Wow, thanks for clearing that up.
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