Rogue amps-- try 5751 instead of 12ax7


I have an Atlas and just swapped out the pair of 12ax7s for 5751s and it's amazing to me the transformation. The Rogue (which I run with KT90s, biased up a bit) has been incredibly detailed for me, good bass, very transparent and I've loved it. Adding the 5751 (Raytheon windmill getters) has injected this really cool vintage-y tone and an incredible soundstage depth.... definitely at the expense of some punchyness in the bass but it's a very worthwhile trade off to me. I recommend giving it a try.
dhcod
I have used both RCA and sylvania 5751's in my Rogue M-180 with Golden Lion KT-88 reissues for several years to good effect. The GL KT-88 are getting a little long in the tooth, i might have to try the Shuguang Black Treasures,
I am going to try kt 120s on my rogue m180s next, I have gold lion 12au7s and 12ax7s on the way from rogue , should have them in a couple of weeks, but I was interested in the kt77s, what do they sound like? has anyone compared kt77s vrs kt120s? thanks, Chris
Here's a copy of what I posted a little while back concerning my "tube swapping" for my Rogie Audio Cronus. Mark and Nick at Rogue have always been extremely helpful. My system makes beautiful music.......
---------------------------------------------------
04-03-11: Adam18

For me, my Cronus, being fed by my Rega P3-24/Exact 2/TTPSU and Rotel RCD-1072, through my Vandersteens, sounds better after I did the following : an RCA NOS 5814 to replace the center EH 12AU7 gain stage tube, a pair of GE NOS Five Star 5751 "goldpins" to replace the Sovtek 12AX7 input tubes, and a pair of GE NOS 12AU7A's to replace the EH 12AU7 driver tubes. I then replaced the original Svetlana EL-34's with a beautiful matched quad of Genelex Gold Lion KT-77's.

All this "tube rolling" was done after some pretty nice conversations with Mark and Nick at Rogue Audio, and I'm glad I followed their advice. They are a pleasure to work with.
-----------------------------------------------
So, Dhcod..... I'm glad you're enjoying your Atlas. Happy Listening !
I use GE triple mica black plate 5751's and made a big difference in my Tempest II. The Sovtek 12AX7's sounded fuzzy and the GE's sound much more focused and clear.
Hi Facten,

Just to make it clear, I was talking about KT77 not KT88. KT77 are an exact equivalent of the EL34. I have no experience regarding Genalex KT88.

Since you suggest me the Shuguang Black Treasures El34, I'll consider them and maybe give them a try someday.

Sébastien