You must not be hanging around much lately Cliff and Jon have worked out a great sounding 6SN7 ouput section using the standard long tail PI and 12ax7. I am a member over at AX84, but have a lot of trouble getting useable info from the site. I have ten or 11 6SN7's kicking around, all tested. I'd be open to adding more gain, if someone has designed it, though. RCA 6SN7s are fetching big bucks on eBay right now, if it were up to me I'd grab the cash then spend some of it on NOS 12AX7s or perhaps some of the higher gain big bottle types.Ĭygnus X1 wrote:I've seen the firefly, wasn't all that impressed with the sound clips, though. I really like the SC7s and the SN7s, they're a thick sounding tube. 6SN7s, 6SC7s and 6SL7s don't have humbucking filaments. The allegedly hi-fi miniature type 6EU7 (similar to 12AX7, different pinout) doesn't have humbucking filaments and the difference in medium to high gain circuits is noticable. That means that any hum from AC filaments (in theory) is cancelled.
SIGNAL PATH IN 6SN7 SERIES
I exchanged email with a builder in Texas who was building guitar amps with multiple cascaded 6SN7 stages, my burning question was, "Why?!!" The 6SC7 or the 6SL7 are much better suited to guitar preamp duties.īig bottle drawbacks: The commonly used 12AX7 (or any 12A-7 series tube) have humbucking filaments. The difficulty there is that a weak B-3 hits the first preamps stages with around 4.5 volts of signal while the hottest guitar signal is under 1 volt. There are some early organ amps that use 6SN7s on the front end.
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