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In Reply to: RE: 6SL7 VS 6SU7 VS 6188 SETTING THE RECORD STRAIGHT posted by Tre' on July 19, 2024 at 16:15:45
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Have Fun and Enjoy the Music
"Still Working the Problem"
Follow Ups:
I saw that too!
Still Gordon of Wavelength noted this in an interview with Stereophile-
"But the 6188s are actually a little different. The plate impedance of a 6SL7 is roughly 50k ohms, but the 6188 is more like 25k ohms, and so it's got a better drive capability. It's an extremely nice tube—detailed and very fast. Because of the low plate impedance and high gain, it drives the 300B better than any other 6SL7 we've ever tried, including the 5691."
The data sheets for the 6su7gty, 6188, 6113 and the 6sl7 all show a plate resistance of 44K
I don't know why Gordon would have said what he said.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
I hear you and I read the same, so I emailed Gordon - here is his response:
The 6188 is a much better tube. That was used in the original Cardinal
and the new Cardinal ST. I never had many of the Tung Sol so I really
can't comment on how good they were. I have a couple hundred of the
Sylvania 6188 and the 6SL7WGT and the 6188 have so much better drive and
detail in my circuit.
"much better drive" To my understanding that would indicate a lower plate resistance yielding a lower output impedance for the stage (all other things being the same).
I wonder why the datasheet doesn't reflect that?
It would be easy enough to measure the output impedance of a 6sl7 stage with a 6sl7 and then a 6188 in there.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
IIRC, the esteemed Mr. Rankin also had some issue with what sort of loading a PP output transformer applies.
I would suspect just a simple bit of mis-translation he picked up. An overlay of plate curves would show the difference. I have a few 6188's and a handful of 6SU7GTY and ooodles of 6SL7's. When I had an amp with a LTP input stage phase splitter, all of them biased up in a group. General random variation IOW... :)
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
Anything is possible.
I did conduct a few preliminary listening tests between the 6SU7GTY Circa 1959 and the 6188 Circa 1972. Here are my findings:
1. The 6188 puts out greater DB on the same songs/passage compared to the 6SU7GTY by 2.5 DB - 3 DB.
2. The 6SU7GTY had a slightly "thicker" sound - in the mids especially.
3. The 6188 were very slightly more transparent, but thinner sounding in the mids. The highs seemed more extended.
4. The two tube types sounded very similar!
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