Armstrod and Jlind325is must buy a lot of gear that requires service. In my entire lifetime this has occured ONCE to a TV set that the dealer promptly replaced. I can't imagine anything going wrong with a pre-amplifier that would be unfixable by an experienced service technician, especially if a schematic diagram is available. What have you got to lose, if you buy it and don't like it? Sell it at a loss of a couple of hundered dollars and try something else. I bought a Chinese Audio Experience Symphonies Plus, and the Balanced line stage model as well and have been quite pleased, the Symphonies Plus is about 4 or 5 years old now. Neither has required service other than tube replacements. I say go for it, play around with tube rolling, have a good time, and write a review, good or bad about the product and your experience. Finding bargains in this hobby is definately part of the fun. Happy listening.