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(They also have 6FQ7 stenciled on them.)
I was looking for something else in my tube drawer and I found these. I recall one night, some time ago, I was drinking and surfing ebay and I accidentally bid on them because I thought I was seeing 6DJ8. Unfortunately, I was the only bidder.
"Two Corinthians, right? Two Corinthians 3:17, that's the whole ballgame. Where the spirit of the Lord-right?-is, there is liberty!"
Follow Ups:
They can also be used in place of 6DJ8/6922 in some (many) designs.
I used them in my old Counterpoint SA3000 as line stage tube on occasion. Mike Elliott designed that preamp for the 6DJ8/6922, but it would also accept the 6CG7/6FQ7. It sounded okay with the 6CG7/6FQ7, however the design spec tube sounded better.
They are 9 pin 6sn7s
A great replacement for a 12au7 but you have to do a little work. The 6cg7 is a much better tube than a 12au7 so it's worth it.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Thanks for the informtion!
I do have a 6SN7 based preamp (Cary SLP 05) I guess I'd need adapters? (I think I already have a couple of 9 pin adapters.)
I also have a 12au7 based preamp that I am not using anymore (Cary SLP 90). When you say "a little work," what does that entail?
Thanks!
"Two Corinthians, right? Two Corinthians 3:17, that's the whole ballgame. Where the spirit of the Lord-right?-is, there is liberty!"
The benefit of changing a 12AU7 to a more linear tube depends on how the 'AU7 is being used. If it's a cathode follower, the effort is wasted. Same is likely true if it's a long tail pair (due to the inherent degeneration of this topology), or if it's inside a 20dB feedback loop.
I do have a 6SN7 based preamp (Cary SLP 05) I guess I'd need adapters? (I think I already have a couple of 9 pin adapters.
There is no upgrade from a 6SN7 to a 6CG7. I use Sylvania Y plate 6SN7 for best sound. Sylvania 6SN7GTA are best year, not 6SN7GTB.
Best I've found are the angled plate versions, whatever the maker.
But a better 6SN7 is a CV1135/CV6. That's very good indeed but you need 2 plus top caps (reversed from 2C22)
As stated good 12AU7 replacement. however, you have to remove jumper on pins 4 & 5. Then, remove filament wire on 12AU7 pin 9 and place on either pin 4 or 5 that does not have any wire connected. Major upgrade from a 12AU7. Best sounding 6CG7 are Raytheon 280 code black plate made in the USA. Careful as most Raytheon are made in Japan.
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