i know there are big changes nfrom my SFL1 and your unit, but I leave mine on 24/7 and have atleast 8 months on a used tube a fellow Agoner gave me.
Preamp Eats tubes..
I own a sonic Frontiers line-3 preamp.The unit eats up NOS tubes.I tried Brimare and matsushita's both within 2 or 3 months the tubes started going microphonic on me.I put in the origanal Sovtek tubes and they work fine.Why does this happen with older style tubes?Are the sovtek tubes built for a tougher demand?