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6SN7 in input position (Read 2290 times)
funch
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6SN7 in input position
03/25/19 at 05:04:14
 
I recently tried a 6SN7 variant (Shuguang CV 181-Z) in place of the 6N1P with an adapter and was quite impressed. I only used it for a few minutes though, and am wondering if it is OK long term.
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armstdav
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Re: 6SN7 in input position
Reply #1 - 03/25/19 at 05:19:56
 
I have a Torii MkIV and I've been running 6SN7s with the adapters in the 6922 position for about a month now with no ill effect. I love the sound from some of my NOS 6SN7s. Definitely better than any of the 6922 variants I've tried.
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funch
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Re: 6SN7 in input position
Reply #2 - 03/26/19 at 03:16:59
 
I just read armstdav's post in the General Discussion section, so my question is answered. The scary part is, I had already read it in the past, but forgot I had. The joys of getting old.
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jcmusic
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Re: 6SN7 in input position
Reply #3 - 02/07/21 at 13:00:39
 
So is it ok to use the 6SN7 tube as the input in the ufo amp?
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Geno
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Re: 6SN7 in input position
Reply #4 - 02/07/21 at 17:00:57
 
Yes it is. I have one in now. I think it is an improvement. Give it a go and see what you think. Experiment with different brands. The RCA GT (smoked glass) is what I have in. Actually mine is a 12SN7GT that Iím told is 12 volts instead of 6. Works and sounds really good.
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jcmusic
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Re: 6SN7 in input position
Reply #5 - 03/17/21 at 13:26:28
 
So I am thinking about trying a 6SN7 tube in the input position, does anyone have a spare tube adapter or know where I can get one other than China?
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Lon
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Re: 6SN7 in input position
Reply #6 - 03/17/21 at 13:42:52
 
Tube Depot (which is a dependable and fast shipping US merchant) has one:

https://store.tubedepot.com/products/6sn7-to-6922-adapter
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piezoman
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Re: 6SN7 in input position
Reply #7 - 03/17/21 at 19:26:42
 
Good post, Lon.

We all need to stop buying Chinese anything when at all possible. Its past time to decouple from the CCP.
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piezoman
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Re: 6SN7 in input position
Reply #8 - 03/17/21 at 19:30:37
 
Quote:
I have a Torii MkIV and I've been running 6SN7s with the adapters in the 6922 position for about a month now with no ill effect. I love the sound from some of my NOS 6SN7s. Definitely better than any of the 6922 variants I've tried.


That's also my experience with my Taboo MK IV. I disliked the 6922 so much, and I had several expensive NOS brands, vs. the RCA 6SN7, that I sold them all. In my system/room/ears, there was no contest. The 6922 provides a bit more gain, nonetheless it was too bright and edgy compared to the more silky smooth and better textured 6SN7.
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jcmusic
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Re: 6SN7 in input position
Reply #9 - 03/17/21 at 23:49:18
 
Lon,
Thanks for the link adapter ordered...

Jay
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Lon
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Re: 6SN7 in input position
Reply #10 - 03/18/21 at 00:15:29
 
You're welcome Jay.

Geno, you wrote:
The RCA GT (smoked glass) is what I have in. Actually mine is a 12SN7GT that Iím told is 12 volts instead of 6. Works and sounds really good.

Did you find a 12SN7 to 6922 adapter, or are you using a 6SN7 to 6922 adapter with the 12SN7GT tube? I have one of the tubes but haven't found an adapter to convert to 6922.
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CAJames
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Re: 6SN7 in input position
Reply #11 - 03/18/21 at 03:11:07
 
You can use the 6SN7 adapter. The 12SN7 is the same tube, just with a 12 volt heater.
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Lon
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Re: 6SN7 in input position
Reply #12 - 03/18/21 at 10:58:53
 
Thank you. I was misremembering the tube in question. It's a 6SL7 which is more problematic.
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HR-1,ZTPRE,ZBIT,ZROCK2,SE84UFO3-25th x2, CSP3-25th.Taboo Mk IV; Rega RP3 w all GrooveTracer mods PS Audio: DMP+DSD,P15,NPC,PowerBases,AC-12 pwr cbls, Reference spkr cbls;Mapleshade:Samson V3;;VooDoo:Cremona+Amati intrcncts, Iso-Pods;headphones:PM1,HD800S,ZMF Ori
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CAJames
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Re: 6SN7 in input position
Reply #13 - 03/20/21 at 16:22:02
 
FWIW the 6SL7 has the same pinout as the 6SN7 so you can use the same adapter if anyone is curious. I just recommend starting with the volume all the way down .
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Lon
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Re: 6SN7 in input position
Reply #14 - 03/20/21 at 20:55:02
 
Thank you! I am trying it out, seems to work perfectly and is sounding nice--an old gray glass RCA.
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HR-1,ZTPRE,ZBIT,ZROCK2,SE84UFO3-25th x2, CSP3-25th.Taboo Mk IV; Rega RP3 w all GrooveTracer mods PS Audio: DMP+DSD,P15,NPC,PowerBases,AC-12 pwr cbls, Reference spkr cbls;Mapleshade:Samson V3;;VooDoo:Cremona+Amati intrcncts, Iso-Pods;headphones:PM1,HD800S,ZMF Ori
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CAJames
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Re: 6SN7 in input position
Reply #15 - 03/20/21 at 22:24:40
 
That's very interesting. While not exactly cheap you can get "heritage" 6SL7s for a lot less than the corresponding 6SN7s, although I think 12SN7s are probably the way to go if you're looking for a budget alternative.
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Lon
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Re: 6SN7 in input position
Reply #16 - 03/20/21 at 22:34:18
 
Not necessarily looking for a budget alternative, got this one in error (the seller's, not mine) and kept it so am glad to use it. I have ordered a 12SN7 to try as well. I just like to explore the options and see how they sound. †I've settled on RCA gray glass 6SN7 in all spots of the CSP3, CSP2+, Monoblocks and Taboo Mk IV so far as being the best, but this 6SL7 in the input of the CSP3 with mods is sounding good. (All tubes in the ZTPRE are Amperex 6085 with converter bases, and an Amperex 6085 is in the ZROCK2). Won't get much time to listen this weekend but did listen for an hour.
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HR-1,ZTPRE,ZBIT,ZROCK2,SE84UFO3-25th x2, CSP3-25th.Taboo Mk IV; Rega RP3 w all GrooveTracer mods PS Audio: DMP+DSD,P15,NPC,PowerBases,AC-12 pwr cbls, Reference spkr cbls;Mapleshade:Samson V3;;VooDoo:Cremona+Amati intrcncts, Iso-Pods;headphones:PM1,HD800S,ZMF Ori
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Lon
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Re: 6SN7 in input position
Reply #17 - 03/21/21 at 02:21:10
 
After let it warm up for a few hours and putting on a more neutrally recorded cd I think this 6SL7 isn't quite linear enough for every day use--though the top end is nice, the lower end is a bit indistinct and a tad too slow. Nice experiment though and I may put it in for more hours of burnin in the future.
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HR-1,ZTPRE,ZBIT,ZROCK2,SE84UFO3-25th x2, CSP3-25th.Taboo Mk IV; Rega RP3 w all GrooveTracer mods PS Audio: DMP+DSD,P15,NPC,PowerBases,AC-12 pwr cbls, Reference spkr cbls;Mapleshade:Samson V3;;VooDoo:Cremona+Amati intrcncts, Iso-Pods;headphones:PM1,HD800S,ZMF Ori
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piezoman
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Re: 6SN7 in input position
Reply #18 - 03/22/21 at 02:27:27
 
I totally agree Lon, on the RCA 6SN7 gray glass in all 3 positions of the CSP3, and the input position on the Taboo MK IV. Rich AND delightful tapestry of detail. To my ears, these have staying in since last summer. With an Eveready-Raytheon ER 280 rectifier in the CSP3 and a 1958 Mullard GZ34 fat base in the Taboo, sitting back in the dark being intimately immersed is a transporting experience.
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Taboo MK IV-25th, CSP3-25th Anniv. Ed., ZR2-25th, ZBIT, Omega Jr. XRS ALNICO spkrs, Omega DH 8 sub, Bryston BDA-3/BDP-2, Brick Wall 8, Ansuz Conditioning, IsoAcoustics spkr. stands, Audeze LCD-3F...PI Audio AQD1 Diffusers, DIY room treatments. ON LIST: TORII MK 4.
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jcmusic
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Re: 6SN7 in input position
Reply #19 - 03/26/21 at 11:34:33
 
I just received an update that my adapter has shipped, so it won't be too long now before I try a 6SN7 in the UFO. It will have to knock me over though to earn a place in the amp, as it sounds really good with the stock tubes other than the addition of the 80 globe rectifier!!!
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