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RE: Tubes for Dynaco ST70 Clone with VTA Board

Why does the center tube have such an effect on the overall sound? I'm trying to learn how to set this amp up and what tubes do what. I'll look into the 12BH7's, are they a direct drop-in replacement for the 12AU7's with the VTA board? I think I read somewhere about using them as an alternative to the 12AU7's with good results. I've got a trio of RCA Cleartops but found them a bit bright with my system. At present I'm using a matched pair of RFT 5814A's on the sides with the Sylvania 5963 in the center with pleasing results.



Edits: 02/28/14

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