I wonder if tube rolling those 6AK5 and 5651 tubes has any effects! Mine is over 10 years old and I have changed every other tubes but still keeping that 2 on the amp! Wonder how long can they last!
I never looked for replacements, are there alternatives available? I made some experiments with 12AX7 but honestly, the Lamm Design is very stable in sonics.
I own my ML2.1 maybe 4 years now and I haven't replaced any tube. The datas are all ok, the units are very reliable. But I use them with 99dB Speakers, anyway, there is worse out there...check the Pins (that they are clean), take care that the Tube sockets have a good grip, that's it.
Yesterday I replaced my first tube, a 6C33C-B after 3000h of use. The others still run strong. A pretty good tube design. Btw. when someone is interested to try a good 12AX7 tube without spending a fortune ---> Psvane
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