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Another Cronus Magnum question

My Cronus Magnum integrated has the Tung Sol KT120 output tubes and a Mullard CV4003 tube for the preamp section. I am still using the stock 12au7 tubes and the 12at tubes. Changing the preamp tube made a big change for a more ripe midrange which is what I wanted. What advantages would there be to replace the other 4 tubes to something better?

If I do change the other 4 tubes, can anyone give me some recommendations? I don't want to spend a fortune, but I assume there are much better tubes than the JJ tubes in there now. Anyone?
128x128stereo5
5 responses Add your response
stereo5's avatar
stereo5 OP
6,385 posts
 
I thought I would revive this thread. I put a NOS Mullard CV4003 (12au7) tube in the center position for the preamp and 2 Mullard 12au7 reissue tubes for the drivers. For the splitters, I used 2 Svetlana 12ax7 tubes. The amp sounds more open now and it is far better than the stock JJ tubes.
jayrossi13's avatar
jayrossi13
183 posts
 
I have a Cronus Magnum as well, I've tried different NOS tubes an ultimately settled on the following:

Preamp - Cifte 12AU7
Section Drivers - Mullard CV4003
Phase Splitters - Raytheon 5751 w/Windmill getter

I've also had a Mullard CV4003 in the pramp position, but liked the Cifte better as I felt the soundstage was more 3D.

Changing out the stock tubes really improves the sound.

How long have you had the amp and how do you like it so far?
stereo5's avatar
stereo5 OP
6,385 posts
 
I bought the amp used in late August. It was 6 months old when I received it. The amp replaced a Classe 175wpc power amp and a Modulus3A tube preamp. I like the Rogue integrated much better, especially now with the updated tubes. This integrated is in my secondary system which is in my home office. I listen to it 8 hours daily with absolutely no fatigue. I may change the speakers to something more efficient like ZU Audio or something similar.
bajaed
269 posts
 
I also have the Mazda Cifte in the pre-amp position. It's flanked by late 50's La Radio Technique 12au7's and Mullard 4004 12ax7's.

Really nice sound from this combination.
jayrossi13's avatar
jayrossi13
183 posts
 
I definitely agree that the amp is very easy on the ears, I can listen for hours without any fatigue.
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