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In Reply to: RE: WECo 91A/B--Long, but hopefully informative posted by maxhifi on November 22, 2014 at 12:46:51
I thought the 6SJ7 was an octal tube?
Or are you speaking of the WE 310?
Follow Ups:
I read an article a long time ago, maybe in audio magazine, maybe radio&tv news, to be honest I forget the origin. The author tested all the small signal pentodes, and the conclusion was that the 6J7 has better performance than the 6SJ7, 6AU6, etc.
What I meant about sockets, is I would prefer to use an octal socket instead of the old fashioned 6 pin socket the 6C6 and the 310A use.
The external grid cap is most likely the biggest contributor to the lower distortion.
In general, I've found that tubes with separate grid/plate caps sound better.
"The external grid cap is most likely the biggest contributor to the lower distortion.
In general, I've found that tubes with separate grid/plate caps sound better."
Is the lower distortion caused by being able to run higher voltage, lower current on the tube, because of the plate cap?
GEC made a KT88 with a grid cap that is much sought after. I would have thought China/Russia would have reproduced by now. George Anderson at Tubelab has a favorite tube that he says is a 300B with a plate cap. Can't remember the name.
Big speakers and little amps blew my mind!
It's because it is not the same tube internally, it's not related to the grid cap.
Are you quite certain of this?
You may be correct - but it seems to me that it was too easy to simply take a 6J7 and move the grid connection to the base.
Lots of tubes are different when you wouldn't expect them to be:
i.e. 6N7 is different than the 6SN7
the 6Q7 has a lower mu than the 6SQ7
The 6J7 has a lower transconductance than the 6SJ7, and better linearity
Probably the 6SJ7 is better optimized for RF use.
I hear you - but I'm still unconvinced that the biggest difference is not (all but) eliminating the grid to plate capacitance.
The data sheets show the same .005pF control grid to plate.I must not be understanding this thread.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 11/23/14
"It's because it is not the same tube internally, it's not related to the grid cap."
Cool. Still it seems that many tubes with grid caps have good reps for good sound. Wonder why that is?
Jamie
Big speakers and little amps blew my mind!
MHF,
"I read an article a long time ago, maybe in audio magazine, maybe radio&tv news, to be honest I forget the origin. The author tested all the small signal pentodes, and the conclusion was that the 6J7 has better performance than the 6SJ7, 6AU6, etc."
I've read the same thing too somewhere. Are yours British made?
Jamie
Big speakers and little amps blew my mind!
Yes, a friend in the UK sent them too me as a gift years ago. I just put them back in the amp... Vesus the RCA 6J7 I have to say the difference if any is sure not obvious. I thought the RCAs sounded better before but now I am not so sure.
Yeah, maybe stick with 6J7 as the safer option.There are good versions of the UX6 sockets available, but availability of the 6C6 tubes is starting to get patchy. I have over ten pairs remaining, but two pairs have broken (cap gripped the loose grid connections a little too tightly). Probably my fault though, oops.
Cheers.
"In the beginner's mind there are many possibilities, in the expert's mind there are few." Shunryo Suzuki
Edits: 11/22/14 11/22/14
I would prefer an octal tube as long as it's within a couple % of the sound I heard with the WE 310A (actually what I heard used a Soviet version of the 310A)
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