will
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The late 50s RCA 6BQ7As are probably the warmest I have, pretty warm actually. Also some earlier GEs I have are warm, but more open, and some Westinghouse are relatively darkish mids down and open mids up. Seems most of them tend to have a bump of upper mid energy. British Brimar, Ediswan and Utron tend to be more open, with good frequency balance within the type... I liked this tube a lot for quite a while, often in the CSP3 input, but in the outputs too. They were really great when my system was tending a bit dark with the other tubes and cables and all I had in.
Interestingly, I put an Ediswan 6BQ7A in the CSP3 the other day to open things up due to burnin muck. Sounds great with this setup.
I think they are really good tubes in general and amazing value for the quality if you need to open and speed up the sound some. If the balance of the rest is a bit darkish/denser/slower, they can balance things really nicely. If the balance is more neutral with 6N1Ps, they may be too bright/open, some of the British ones tending to be a little more so, especially the Brimars I have. I think compared to most inputs, these tend to create more spacious mids and top a little more than most.
I never liked 6N1Ps because of clipping in my Torii at too low a volume for me, but also because they are missing micro detail I need, whereas 6BQ7As tend to be good at micro detail. The thing I don't like is a little veil in the mids of some of the type...it is a weird sort of veil, the notes quite articulate and with a lot of micro information, but with a darkish feel to the low mids.
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