I get tube rush at 12 oclock from my new Rogue 99 preamp phono stage.The input tubes in it now are sovteks.What 12AX7 is very quiet and microphonic free? THANKS!
Telefunkens are great, but I recently replaced my stock 12AX7 with a Heintz & Kaufman Gammatron, made in the USA. Just great. Fast and almost as musical as Tele's. Application will dictate, so experiment.
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