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My Yaqin MS-23B phono preamp sounds WAY better with these Sovtek 12AX7LPS tubes than the stock Chinese 12AX7B tubes! The mid range just comes to life. The high frequencies are more detailed, still nice and smooth sounding. Bass has more authority. Very nice 3D sound stage! Higher gain, don't have to turn the volume as high. Highly recommend the Sovtek 12AX7-LPS tubes for a phono preamp! Viva Tubes puts stickers with the test readings on each of the tubes on the box, so you know your getting a nice matched pair! Excellent service!
Verified purchase: Yes
I bought some 12 a X7 LPS tubes. Viva tubes did an excellent job of answering questions . Very helpful , straight forward answers . Clearly they test all their tubes they sell as indicated in their postings . Top notch seller , happy to buy from Viva tubes . Thanks again for your help and knowledgeable answers to my questions .
Verified purchase: Yes
These sit in the preamp stage of a restored HHScott amp and helped measurably with phono hum. I've tried NOS 12AX7's in the past only to run into a noisy tube every now and again. Glad I went this route.
Verified purchase: Yes
Just did an overhaul on a 1996 Fender Blues Deluxe using the Fromel Supreme Mod kit and these matched tubes. I could not be happier with the results, the amp sounds incredible.
Verified purchase: Yes
Love viva! Love the sovtek long plate ax7 tubes. Super duper awesome phase inverter tubes that are tested for balanced and sold at an awesome price! ... did i mention the crazy fast shipping! Thank you Viva tubes 😎
Verified purchase: Yes
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