Life span depends upon amp design/application. Originally tubes were designed with a 10000 hour life span. if the tubes are used 'nicely' then they should last. I know that the old quicksilver 8417 monoblocks would eat tubes ~ a set every 10~18 months, but a Music reference RM-9 can keep the same tubes in place for 10 years. THis I also know to be true as I just replaced the tubes on my RM-9, and have had the amp since 1990.
The mac should be on the longer tube life end of the scale.
Happy listening
The mac should be on the longer tube life end of the scale.
Happy listening