5751 tubes in Rogue Tempest?

Use a 12BZ7 in place of the 12AX7. Rouge confirmed this is safe to do and the amp sounds way better. Much more dynamic and musical. Been running mine this way for more than a year. Got the idea from Cary folks who often do this on their amps.

I read the Joe's tube Lore page too,and immediately scored a pair of Sylvania JAN gold series 5751s off Ebay.First let me say that they were cheap! Next,,,,,,drum roll,,,,,,,

WOW! I put them in my modded Dynaco Pas line stage and it was absolutely shocking!
The veil was lifted,the clouds parted and music came out.Literally out too. The sound stage came so far forward it was scary. At first I wasn't sure what I was hearing.It seemed like there was more gain instead of the 70% that the 5751 has to the 12AX7,but the vocals were so much further forward that it sounded louder.Weird,but cool.Transparency,inner detail and sweetness.A system transformation.
Any and all that have 12AX7s in their preamps need to try this. I can't imagine going back.

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I use RCA 5751's and 12AU7's in my M180's, and RCA 5692's in my 99 Magnum preamp. I think the system sounds great. Strong bass, rich mid-range, silky highs with lots of detail but without sounding sibilant. I have Mundorf S/G/O capacitors in my Silverline speakers, and interconnects and speaker cables that transmit a lot of detail. Tubes that are described as being very "airy" weren't a good match for my system - too much sibilance.