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Bob, did you roll tubes on the 1501RC? I read your comments in other threads and can tell that you're not a fan. I am seriously considering this amp for a 3rd system with Energy RC-50s for movies and some music with a Velodyne servo sub.
rnstehno, interesting that you prefer the 1301 to the 1501 since they seem like they're cut from the same cloth with the 1501 being much more powerful.
Eugene, I did replace the stock input tubes with some NOS tubes from Upscale audio. I don't recall that having any appreciable effect. You can tell I'm not a fan of what?
I really enjoyed the 1501. It was a good early experience; learned a lot. The 1501 is what it is -- a relatively inexpensive hybrid integrated amp. It's not a piece I would consider today.
I also used it with a Velodyne sub using speaker level connections and that did not work out well at all. It was my first attempt using a sub and biased me against them for many years. Now I'm a huge fan, but I will avoid speaker level connections.