Loading... Please wait...Mullard 6201 - This is the gold pin version of the CV4024 ...they seem to have a little more zip on top, and a smidge more bass extension.
This, along with the military CV4024 are the most popular 12AT7 types we offer. This is a much better choice compared to the Amperex as this particular Mullard sounds better and will last a lot longer. We also have some of the earlier Mullards and Amperex with folded over plates but they never test as well or last as long.
Platinum grade - The best of the best. Lowest noise and microphony with the tightest triode balance we have available. This is typically 10% or tighter, but may be higher depending on available stock.
Gold grade - Low noise and microphonics with a triode balance typically between 15% and 20%, but may be higher depending on available stock.
Driver grade - Lowest noise but not the lowest in microphony. Triode balance will be similar to Gold grade.
This grade is only suitable for use in the driver stage of an amplifier, or the output/buffer stage of a DAC or CD Player.
If you have a preamp or phonostage, you need at least Gold grade.
Click here for a more in depth discussion on how we grade tubes.
Posted by John
Bought two Cryo treated Platinum grade Mullard 6201 to replace my Mullard CV4024. The tubes were used as driver tubes in my amplifier. I am amazed that the 6201 sounds more neutral, transparent and dynamic over the CV4024 while retaining the warmth of the music. Not sure the improvements are due to the Cryo treatment or the 6201 quality. Anyway I am very satisfied with this purchase.
Posted by Zachary Auld
I dont know about you Hifi guys, But as a guitar dude i like this tube alot. It's well balanced with rich detail, smooth and i would describe its presentation as polite. It projects a natural voice. The 6201 tie's my output tube's together and does a great job of relaying the tone. As allways i was provided a tube with very closely matched sections.Thank you Uncle Kev and the upscale team.. Happy Zach!!!
Most of you already know that Upscale Audio is the premier destination for expertise and availability of vacuum tubes for high-end audio equipment. So when we offer servies and options, you can be guaranteed that it represents a significant investment of research and capital, and that the end result will greatly enhance your listening experience.
Upscale has contracted with the foremost company involved in this technology, 300 Below, to treat our most popular tubes. Other tubes will be added as time allows, but it is a time consuming proccess. Our intention is to have most stocks Cryogenically treated before we even test them.

Of course, your first question is – and should be – why? In a nutshell, reducing an object’s temperature to -300ºF re-arranges its molecular structure, creating greater uniformity that results in longer life and better performance than when the product was initially designed.With vacuum tubes, this process has a profound impact on a tube’s ability to endure thermal shock. Therefore, tubes can last longer and their sound can been enhanced in ways that are simply exquisite.
After thoughtful and thorough research, Upscale Audio chose 300 Below because of their extensive experience in working with musical instruments as well as auto racing, metal tooling, and high-end sporting goods from rifle barrels to golf clubs. Expect nothing but the best from Upscale Audio.
Our charge for Cryogenically treating tubes is a fraction of what others charge, though we use the premier company. Count on Upscale to do the best job and not price gouge . Also available is cryogenic treatment for cables, along with our well-known Nordost Vidar cable treatment system. Call for details. Pricing is listed on each tube and cable page.
Vacuum tubes are warranted for 90 days against defects, except in cases of abuse, and replaced with like-item only.
Exceptions to our warranty policy are as follows:
Upscale Audio is not liable for any damage or injury caused by the improper use of its tubes or the use of an incorrect/incompatible tube type. If you are unsure of what tube or tubes your equipment uses, consult the manufacturer before making a purchase. Using an incompatible tube type may cause severe damage to your equipment and will void your tube's warranty.
Vacuum tubes are electronic parts and are not refundable under any circumstances.