Aric Audio Systems Unlimited Preamp
Look here and scroll all the way down. I found this chart to be pretty darned accurate . Maybe it will help some of you here . This is for NOS tubes not new stock. https://tubeworld.com/12ax7.htm |
Here are a couple of comparisons/reviews for the new stock 12AX7 tubes: https://www.thetubestore.com/12ax7-tube-reviews https://www.tubesandmore.com/tech-corner/12ax7-comparison-current-made-tubes |
By the way, I must mention that the quality of the phono stage in the Unlimited is also pretty decent. Anyone considering using a turntable may want to opt for low(er) noise (and/or lower gain) tubes depending on the cartridge used.The linestage is dead silent regardless of the tube choices once the gain is optimized based to the amplifier input voltage sensitivity and the speakers’ efficiency. |
So I've been playing a little with signal tubes,I just received a matched pair of Amperex Holland Rogers 12ax7's. These are wonderful tubes. Great tone,added 3D soundstage. They add more magic. I have also rolled in a pair of Sylvania red label 12at7's,and a pair of Sylvania JAN green label 12at7's. I think they all have similar tone,but the Amperex's are king of the soundstage. The red label Sylvania's come in second,and the green labels a very close 3rd.(very close) When first plugging in my Unlimited,I was very skeptical about how the sound could be improved upon. This is simply a steal,and very receptive to tube rolling. Maybe sometime in the future I'll try the cap upgrade??? |
