kt88, I had a Belles 20A for a while and it is a bit dark sounding, more so with some NOS tubes like RCA blackplates. The pre just lack the top end sparkle imo. I have also had various 6sn7 preamps because I like this tube, big open sound. The AES AE-3 DJH for example sounds more open to me but does not have the strong bass your 20A has.
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