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Keep the driver stage, the 6N6P, as new as possible. This tube is very critical for the given amp. You might get a tube tester and measure the mutual conductance but with the low price of 6N6P I think it is hardly necessary. I would change it as often as twice a year if you use the amp a lot. The 12AX7 can live in this amps for many-many years, find a good one get an pair and it will be enough to the rest of your live. The 3C33C should be changed in this amp once a year, with very minor variation of frequency of use and your preferred plate current.  The gas reference and the regulator amplifier might less for a few years as long as the plate voltage is stable and no nose is auditable. The big regulator tube I never changes and usually used the used up V2 tubes… BTW. You might get slightly more “juice” our of older ML2 by loading your probably 8R speaker (I do not know what you have) to 16R ML2 tap. You will loose some power but gain something that you might like. The tube will be slightly less loaded and you might with to drive it with less current. By doing the current-loading balance  *even the ML2  not as sensitive to loading as some no-feedback amps) you might dial in very precise harmonic balance of sound and very precise dumping of you LF section (sure the multi-amping will defiantly help)…

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