Kevin
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It will be quite a while before I have impressions in the detail you requested, sorry. In general so far, and as expected, the 6l6 types I have tried (new Black Sable 6l6, new Valve art 350b, 1940's Philco 6bg6 and 1950's GE 6bg6) sound "bigger" than the 6v6 (of which I have the nice Russian set that came with the amp and 1952 Bendix 5992). I also picked up a set of nos 6y6 but have only run them for 30 minutes or so.
Is bigger better? Maybe. Maybe not. Pretty much impossible to tell what another person will like. It seems I like the bigger sound of the 6l6 types.
As for me, I would have to say that so far I am liking the Philco 6BG6 that are pictured above the best. Nice large and rich sound, way beyond the outside of the speakers, lots of detail but still smooth. All adjectives that mean something just a bit different to everyone.
All of my time has been with the 12at7 as driver.
As an aside, the 50+ year old 6BG6 tubes are really well made beauties, with ceramic spacers, etc and would probably cost a ton of cash to reproduce today.
I would say, use the 6v6 tubes that come with the amp, and get a set of one of the 6l6 types, and you have a good idea of what to expect from the mini.
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