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McIntosh 40 MC40 Can I use KT88 or 6550?

MC 40 can put out over 55 watts and meet specs. So to get worth while improvement you would need a MC 2000 capable of close to 150 watts per channel or the new MC 1502 which will put out closer to 170+ watts per channel. Most people don't need 2301's or the new 3500 that might be fun. I loved the original 3500 with my speakers but chose to bi-amp with two 275's in 1969. Having 4 3500's was a lot of dough back then. But then I could have saved money on the heating bill in the winter time.
 
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