Tubes Asylum

RE: The 6su7gty also has a plate resistance of 44K

76.90.100.230

Tre'

P

In Reply to: RE: The 6su7gty also has a plate resistance of 44K posted by MP62 on July 29, 2024 at 10:13:43

"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"

Follow Ups:

RE: The 6su7gty also has a plate resistance of 44K - PakProtector 15:03:02 07/29/24 (1)
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.
- RE: The 6su7gty also has a plate resistance of 44K - MP62 23:13:40 07/31/24 (0)
  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!

Post a Followup:

FAQ

Post a Message!

Forgot Password?

Moniker (Username):
Password (Optional):
	Remember my Moniker & Password (What's this?) Eat Me
E-Mail (Optional):
Subject:

Message:	(Posts are subject to Content Rules)

Optional Link URL:
Optional Link Title:
Optional Image URL:
Upload Image:
E-mail Replies:	Automagically notify you when someone responds.

To view your new posting or follow-up, click on the RELOAD or REFRESH button on your browser.

This post is made possible by the generous support of people like you and our sponsors:

Kimber Kable