Tubes Asylum

RE: 6sn7 GTA or GTB ???

75.161.16.146

In Reply to: RE: 6sn7 GTA or GTB ??? posted by amandarae on October 20, 2009 at 15:56:30

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

Follow Ups:

Yes, I know! I have the RCA and GE manuals! NT! - amandarae 20:53:48 10/20/09 (1)
- Um, OK. It just seemed like... - JimL 21:05:16 10/20/09 (0)

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