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In Reply to: RE: KT88/6550 suggestions +1 more GL posted by samzx12 on March 27, 2017 at 09:49:12
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.
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.
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