Charles1dad,
I certainly hope the tubes will last much longer. I would expect that running tubes conservatively will lower distortion and should sound better. However, I know of a number of people who deliberately run certain tubes quite "hot" and like it that way. For example, a friend runs 45 tubes in an Audionote Kageki (parallel 2a3 amp) and likes the sound, although the tubes don't last very long. I don't know if he just likes the sound of the 45 more than 2a3 (I prefer 45s too) and would actually be better off changing the operating parameters of the Kageki to match the 45 (primarily lowering the plate voltage). I own a pair of Kageki amps too, and would never run anyting but the recommended tubes for fear of damaging a VERY expensive amp.
As for the benefits to longevity of running stuff conservatively, there are plenty of examples of people who have old tabletop radios that are still being used daily that have never had tubes replaced since the radio first went into use in the 1940s and even earlier.
I certainly hope the tubes will last much longer. I would expect that running tubes conservatively will lower distortion and should sound better. However, I know of a number of people who deliberately run certain tubes quite "hot" and like it that way. For example, a friend runs 45 tubes in an Audionote Kageki (parallel 2a3 amp) and likes the sound, although the tubes don't last very long. I don't know if he just likes the sound of the 45 more than 2a3 (I prefer 45s too) and would actually be better off changing the operating parameters of the Kageki to match the 45 (primarily lowering the plate voltage). I own a pair of Kageki amps too, and would never run anyting but the recommended tubes for fear of damaging a VERY expensive amp.
As for the benefits to longevity of running stuff conservatively, there are plenty of examples of people who have old tabletop radios that are still being used daily that have never had tubes replaced since the radio first went into use in the 1940s and even earlier.