I would suggest taking a look at the Artemis LA-1. If changing tubes is that much of an issue you won't need to often with this pre. It uses 2 5687 dual triode tubes one for each channel and only heats 1 of the 2 triodes. Once the tube goes you swap channels and your good to go. The manufacturer calls it Cool-Swap Technology. You will get an easy 20,000 hrs on a set of tubes.
