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good use for 6sn7

1/29/2004 3:07 AM
good use for 6sn7
I have become a bit bored with 12ax7s, so I picked up a handful of NOS 6sn7's (they were cheap). And of course now I am wonding if I can put these to use in a new project. Can someone point me to a fat/clean preamp design using this tube?  
1/30/2004 4:04 AM

Hi Stan  
Gibson used 6SN7's in some early amps (the BR-9 ? - not sure, I'll have to check the schematics). Also, I think some early Ampeg amps. I'm using 6SN7's as the preamp tube in two old mono audio amps. When I was wiring them up I looked into some guitar and audio amps that used them.  
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1/30/2004 7:48 AM

Thanks for the reply Dan. I have looked at a bunch of old schematics, and I have seen the ampeg schematic using the 6sn7 (and a few other schematics), but it seems that this tube was used for phase-inverters or to drive a reverb tank, rather than as a straight ahead gain stage. I'll go hunting through Gibson schematics now...thanks for the tip.
1/30/2004 3:18 PM

the 6SL7 is far more useful as a gain stage, since it has a voltage gain of about 70, while the 6SN7 is only about 20
1/30/2004 3:56 PM

The Gibson BR-9 I once owned had a 6SN7 as the pre-amp with a xfmr PI driving PP 6V6's.  
Very clean sounding amp. As previously noted, I tried a 6SL7 and the amp had a lot more grind.  
1/30/2004 4:41 PM
Bruce /Mission Amps

I've used a couple 6SN7s as power tubes in small low power SE and push pull amp...they sounded great!  
1/30/2004 6:38 PM
Jim C.

I've got an old Gibson GA50T that I got in highschool back in the 60's. It has a 6SN7 for the phase inverter driving a pair of 6l6's for the final stage. The preamps are 6SJ7's. That sure is a sweet old amp! To my ears, the 6SJ7's and 6SN7's sound smoother and less "gainy" (if that's even a word) than the 12ax7's do in my Deluxe Reverb. But there are a lot of ckt. differances between those two amps too. The old amps with the 6s::'s made great jazz amps!
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