Please forgive my complete ignorance. I have noticed that you have rightfully ignored it. The INT sound like a very good deal. If I had a place for it I might have bought one for myself. I am a tube-o-phile so I might be happier with the JOB power amps with a tube pre amp.
mechans,
If you do pair a tube preamp with Job amps, please look for a preamp with low gain. 10db of gain or under is preferred.