I use an Aronov Audio LS960i tube integrated which is excellent, and appears for resale on Audiogon around $1600, sometimes less. An owner of the Krell you mentioned ended up wishing he owned the Aronov, after hearing mine powering my Duntech monitor speakers for about 30 seconds (and continued to feel that way after prolonged audition.) Moderate priced tube equipment often surprises owners of moderate priced transistor equipment. The Aronov has been reliable, and requires no periodic adjustments.