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12AX7 tube comparison | i give my thoughts more at the end of the video.
Old footage, but combined the three, to make it easier.
Thanks for watching.
If your phono preamp is only worth $200/300 buying $200+ tubes might a bit much maybe.
You may notice an audible difference However, if you need to replace them due to the tubes needing replacing, hopefully you can find a nice replacement at a good price.