You're likely already doing really well with the 5692s. I ended up going with them on my Blue Circle BC2s after trying many others. A couple of tubes that are supposed to be even better are ECC32/CV181 type tubes, in particular those made by Mullard. Also, I am given to believe ECC34 may be even better than those. I haven't tried them though. I don't know about the other tube type you mention. Good luck.
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