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Then he's ripping people off as there's no way he can honor that commitment in 50 years.
His commitment is for 20 years. Even then, I expect someone else would have to fix it!
I found this article below which, if I understand it, basically claims that the Bobfather's design allows the tubes to run cooler; thus extending their life. I'm pretty much a dummy with electronics and it's all Greek to me but maybe you tube guys can make some sense out of his claims. All I can tell you is that I heard them and was quite impressed with the sound. http://www.enjoythemusic.com/superioraudio/equipment/0512/bob_carver_cherry_180_tube_monoblock_amplifier.htm
Thanks for the link. Interesting read. What Bob is doing is running the tubes at a fraction of their rated output, and the amp will respond as more power is required. I also agree with Bob about pentode vs ultralinear.
I don't get all the dumping on Bob Carver.In my estimation he is a true audio genius. I have used his products for years without a hint of problems, no breakdowns or hiccups at all.The music was there every time I turned it on! Reasonable prices to boot.Marlin