RCA Red Base. Older versions are Black Plate, Newer are Gray Plate. Some have branding other than RCA, but are RCA manufactured. Just like the 5692 (6SN7.... Jul 7, 2019 6sl7/6sn7/6v6 fs Sets, Parts and Service Information Offered (private sellers only, exact price required, no swaps). Aug 27, 2014 I like both 12A-7 preamps and 6SL7 tube preamps, for different ... If given the choice of using any octal NOS tube, I would pick 6SN7 over 6SL7. 538a28228e gavgear
https://coub.com/stories/4266061
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