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In Reply to: RE: KT88/6550 suggestions +1 more GL posted by mcgjohn@yahoo.com on March 27, 2017 at 09:34:53
You are the 1st person I have heard give any feedback concerning the Mullard KT88. Have you compared the GL and Mullards or heard both?
Follow Ups:
have a quartet of each. The Mullard 88's have a fuller, much warmer sounding midrange than the GLs or the Tungsols. Not too far off the original Mullards from the UK.
Have the Mullard KT88s in a PL dialog amp with Jensen copper foil caps, and MILLs WW for the plate and cathode resistors.
If your re-worked amp is a tad on the warm side, the Mullards might be too much of a good thing. All depends on the other components that are used.
The Tungsol 6550s sound great (well balanced) in a Mac 275 or CJ MV75.
As one other poster noted, there are also some premium KT88s out there, but have not tried em.
Thanks John appreciate it. I was always interested in the Mullards but could never find much feedback.
NP.
Just don't forget (as am sure you are aware), the coupling caps also influence the tonal qualities of a given amp.
If you are using Russian K40s, the Mullard 88's might be a bit too much, so would opt for the GLs or the Tungsols. On the other hand if you are using a V-cap for couplers, then the Mullard 88's may be a nice selection.
I do remember John you mentioning the cap upgrade path. I have not gone down that path with my Primaluna Dialogue Premium. Right now I am using the GL KT88 and experimenting with 12AU7. I have some NEC 12AU7 Mullards(highly recommended) on the way so once I get these evaluated I'll have a good sense of the direction I am headed. So far, I like the GL however, it is amazing how much influence they have on the overall sound and tone.
forget that GLs, Mullards or EH stuff! Penta KT88 SC beats each of those!
"How the fuck did our oil come under their sand?"
Edits: 03/27/17 03/27/17
Thanks for the heads up Nunki. In what way do the Pentas beat the GL and Mullards in your opinion?
well, in MY gear (rogue audio ATLAS MAGNUM) the pentas sound crispy, fast and lifelike. great even for classic music.
previously i tested KT88 brands like GL(reissue), JJs, Sovtek, Treasure Z, Svetlana winged C, Psvane KT88 T-Mk II, Ei KT90, TS KT120 etc.
the Tresure Z is a great KT88 too but finally i sticked with the pentas. they do nothing wrong.
N.
"How the fuck did our oil come under their sand?"
The PentaLabs run is over, now sold by the tubestore.com as the Prefered Series KT88. Even come with a 6 month warranty. Dougs tubes also has them under the "Ruby" name I believe.
This is the "best" currently manufactured KT88 on the market.
Ruby isn't listing the KT88SC (KT88V-STR) on their site at present, so I wonder if Doug's Tubes is only selling remaining stock purchased from Ruby.
The TubeStore apparently has them as its Preferred Series KT88.
That is something I calculate into tube choices. If, for example, one tube fails in the first few months, do you want to find out that you can't get them anymore?
the Rubys have holes in the anode plate. the penta SC have solid plates and definitely no holes!
"How the fuck did our oil come under their sand?"
Doug's Tubes stocks two versions of the Ruby tube, the KT88-STR, which is the Shuguang Kt88-98, three holes and the KT88V-STR which have the solid plates and is his current substitute for the Penta KT88SC.
The Ruby KT88V-STR solid plate is supposedly the same tube, the Preferred Series, that Tubestore sells.
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