I had the baby brother M-504. It was bulletproof. I finally sold it to change to Adcom & Parasound. I liked everything except the binding posts-they won't accept spades.
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I got mine Grand Integra M-508 twenty years ago on the tropical island of Guam for $550(while in the Air Force). It's been hauled all over the world with me and used at least twice a week(for hours on end). The only problem I've had is one of the green lamps on the right power meter burned out-- other than that it has been bullet proof. It has no problem with the treble-it has always had a deep,smooth,rich,luxurious sound--sort of like a 70's vintage high end Marantz. However, I am worried that the eight huge 10,000uF capacitors are going to go bad in a few years(just due to old age), and to get them replaced would cost about $500 for parts and labor.