The 6SL7 that Dennis sent says Brimar on the box. He included an RCA 6SN7 as well. I have quite a few 6SN7's from my long ago times with another preamp. I know I have some RCA's, Raytheons, Sylvannias, and some VT-231 I think. Which 6SN7's do you all prefer and why?
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