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Changing Preamp tubes on a Cronus Magnum?

In an earlier thread, I mentioned getting my Cronus Magnum on Friday. The amp was well broken in when I got it and I have put at least 24 hours on it since receiving it Friday morning.

I want to ripen the midbass/lower midrange a bit and from what I understand, it's the center 12au7 tube that makes the most difference. What would be a quiet tube that will ripen the sound a bit? Thank you.
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adam18
670 posts
 
Call Rogue Audio and speak with either Mark or Nick. Nobody knows tube upgrades for their amps better than they do, and they will happily help you out.
adam18
670 posts
 
For me, this really worked quite well ..... in the center small tube slot, an RCA NOS 5814 replaced the original Electro-Harmonix 12AU7 gain stage tube.
jayrossi13's avatar
jayrossi13
182 posts
 
I have a Cronus Magnum and experimented with a bunch of different NOS tubes, I finally settled on the following :

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

This setup gave me the best all around sound (nice midrange with some sparkle on top).

I tried a Mullard 4003 in the preamp position, but liked the Cifte much better. I also tried Telefunken 12AX7 smooth plates in the splitter positions, but liked the Rayhteon's better.
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