ran stock 6550s, 120s, and chryo 120s in my pr 12 and the former and later in my lp 275s. In both cases the 6550 we're slow with less frequency extension at both ends, less detail, warmer. The non chryoed 120s were about a third of the way difference wise between 6550s and chryoed 120s. With the 275s and chryoed 120s I get fender not generic base with grawl that I like very much. I have put the 6550s back in after various other changes and found them wanting. If I keep them I may use them for burn in duty or during the summer when ac is bad. Try and find a seller of 120s that will allow them to be sent back to be chryoed if you are not happy with regular 120s
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