Finally, a faithful reproduction of the Mullard 12AX7. This tube has the chime and lushness you would expect from a Mullard without all the cost. We really like this tube in classic Fender Deluxe amps and Mesa hi-power amps. These also sing in Hi-Fi amps. We tried them in our AcroSound 20/20 and were very surprised at their accuracy and detail. We like them in just about everything we have tried them in.