2. amps-preamps
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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.
128x128stereo5
jayrossi13's avatar
jayrossi13
182 posts
 
@ Bajaed

I actually like the Cifte better than the Mullard in the preamp position for the 3D soundstage. I'd be interested in hear your opinion once you've tried the Mullard.

I've gotten most of my tubes through Upscale, Kevin was very helpful.
sebastienl's avatar
sebastienl
84 posts
 
Hi stereo5,

I agree with adam18 regarding a n.o.s. 5814. On my side I had a GE 5-stars, triple mica from de 1960's. Make sure that both triodes of the tube you'll use are perfectly balanced.

In the time I had my Cronus, I exchange some email with Rogue's owner Mark O'Brien and he always had good suggestions for tubes in this amplifier.

Sébastien
stereo5's avatar
stereo5 OP
6,254 posts
 
I bought a cryod Mullard 12au7 nos tube from Kevin at Upscale Audio. I noticed the difference as soon as I inserted the tube as it was quite dramatic. I received it earlier today. The Mullard seems to have done the trick. There is now the desired richness in the midrange and I am quite pleased with the results. Thank you all for the help.
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