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Aesthetix Calypso, Tuberolling questions?

What results have owners of this preamp had with different tubes used. I'm running stock tubes into a pr. of Parasound JC-1 mono blocks now and the sound is very good. Would like to open up the treble a little if possible without messing up other areas. Any info on what people have tried and to what results would be of great help. Thank you
tom_hankins
mechans
3,048 posts
 
What pray tell is a GT never heard of it. Is it a type of 12AX7 as in a 12AX7WA or is it a brand?? If so where do they come from etc.
clio09
3,355 posts
 
GT = Groove Tube, 12AX7 tube. Sold in many guitar shops, but used in audio as well. Supposed to sound like a Mullard if I'm correct. I have a couple lying around here that I wasn't too impressed with. Price is right though and you could do a lot worse for new production tubes. Golden Dragon sounded better to me. Of course IMO nothing beats NOS of which I have Mullard, Telefunken and RCAs that I rotate in my phono stage.
taoh2
6 posts
 
GT tube suck. I order a platinum grade GT 12AX7 from upscaleaudio, one of the two make noise the second day and Kevein won't even allow me to exchange it. I try many other 12AX7 from GE, telefunken, sovetk. all sound better than stock one and no noise.
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