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In Reply to: RE: "6J7 has lower distortion than 6SJ7" posted by Jim Dowdy on November 23, 2014 at 06:17:58
"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!
Follow Ups:
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!
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