I just bought circa 1965 NOS Telefunken ECC 83 rib plates and I was blown away as to how much better the ML 2.1 sounds as compared to the 12AX7 tubes supplied by Vladimir. Mine were Sylvania.
I did research on the tubes and everyone recommended the rib plate vs the smooth plate
I also managed to buy circa 1957 NOS Mullard 12AX7 long plate with square getter halo. I find these to be warmer than the Telefunken but not quite as detailed
If you have the opportunity to audition the Convergent Audio Technologies JL-2 amplifer (100 Watts, Class A, Triode), I would do so. Along with the LAMMs, among the best.
The JL-2 is a completely different beast than the Lamm. My very close friend has JL-2's. I have heard them and find them excellent but in a different sort of way than the ML 2.1.
I would compare the JL-2 to my last amp--Audio Research Reference 600 Mk lll's
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