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Warmer 6922 for Lamm M1.1 monos

Posted by montaldo on January 7, 2017 at 14:06:41:
I just bought a pair of Lamm M1.1 amps. Incredibly capable amps but they just have too much treble energh for me. I am going to try tube and cable changes to see if I can knock down the treble a bit. Coming off a Shindo amp so I am a bit shell shocked :)
The Lamms have a single 6922 per amp. Currently they have Amperex Bugle Boy 6922 made in Holland, which I have been told are good tubes. Could someone recommend replacements that would be warmer and significantly more rolled off in the high frequencies? Just to be clear I am not looking for a balanced sounding tube or a neutral sounding tube. I really want one that most audiophiles would consider too dark on top. This is a system balance issue and my own preference for a warm organic midrange and a slightly darker tonal balance.

Thanks for thoughts!