Shorting the life of my tubes?

[Mr.Hetfield]

Does cranking the master volume but keeping the channel volume low, on my dual rec, shorten the life of my tubes?

 

[ibanez4life SZ!]

I wouldn't think so. The combination or volumes doesn't matter. Tubes are made to work and be pushed. Cranking an amp regularly will make them go faster than if you keep it really low all the time, but that is normal. They should still last you a year easily.