I have found that the Ken Rads give the best bass presentation but may be microphonic (careful), the Tung-Sols are absolutely the most transparent and toneally neutral, whith mid range that is superb. Sylvania's a a good tube, the RCA's having a nice liquid midrange but can be a bit etched. The Sylvania metal bases are nice to look at but don't offer anything in the way of top notch sound, they are just expensive because they are cool to look at. The Electro Harmonix sound very nice indeed for a new tube at a very cheap price. The 5692 red bases are a nice tube, but don't dissipate the plate voltage (heat) required for the application in Atma-Sphere amps (much shorter life), so try to stick with 6SN7 GTB's as best you can. I am using a combination in my M60's: KenRad in postion #1, Tung Sol in #4, and a pair of RCA's (or Sylvania's) in the middle positions. Hope this helps, FWIW. Asking Ralph Karsten (at Atma-Sphere)for his opinion would also be a good idea. Happy Listening.
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