Is there an average life span for a preamp?

My impression is that it should last a long time. It seems that you all feel the same way and that is good to hear. This particular component is class A and it does run warm when it is on. Does anyone feel that this makes any difference?

AFAIK every preamp is class A. Saving power (class AB) is unimportant in preamps.

Joe,
I've had the same pre-amp for going on 13 years. I have not had one bit of a problem. I can't believe how good that little thing sounds. Unlike you, however, I'm not really fond of the "passive" mode. But I'm glad that you like it. I can't believe Adcom stopped making the unit. Find yourself a reputable tech and put him/her on standby. If it ever needs servicing, it should not be a major deal. If you live in the Hudson Valley area, let me know. I can recommend a good technician.

In the meantime, keep enjoying that little giant killer!

Yes, but it is unknowable for each particular case.

I've had my Luxman preamp for over 35 years without any problems whatsoever.