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In Reply to: RE: "Tube Lore" lists the 6670 as a premium 12AU7 (nt) posted by JazzDude on November 06, 2016 at 21:37:10
I've used the GE 6680. Think it's a selected 12AU7 for low-noise. Tone-wise = blah. I have not heard or seen a 6670.As for tone... the CBS-Hytron 5418A and 7316 are my standards, as US tubes. Philips, S/H, Valvo E82CC or TFK ECC802S, as European made tubes.
Rare 12AU7 variant is the CBS-Hytron 7318. Wish I had stocked up on a few more sleeves, 20 years ago. 8^(
Edits: 11/06/16Follow Ups:
should be able to use those?correction: could he use those!
I do see from the answer below it's a NO. Thanks
Edits: 11/07/16
I've used 7730 and 6189 --- IIRC, nothing special, tone wise. I only look for good 5814A and 7316, in all-numbered 12AU7 sub-types.
Edits: 11/07/16 11/07/16
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