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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.
Follow Ups:
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.
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