"warmth" i believe is something to do with distortions and colorations and it's not part of precise signal delivery.
transparency is explicively part of precision and performance.
i believe that by gaining warmth the transparency is jeopardised.
i own sunfire 300 mk2 amp that i've purchased for very low price for more than 10 years and every time i was thinking of upgrade, i was thinking again to keep my amp and it's never got upgraded ever since. with tube SETs you may not achieve the desired performance simply because you don't have efficient enough speakers. the most transparent and precise tube amp i've ever heard and not only for your budget, but overall was quicksilver M60 90's model. it's extremely hard to find, but if you get lucky snatch it quick.
transparency is explicively part of precision and performance.
i believe that by gaining warmth the transparency is jeopardised.
i own sunfire 300 mk2 amp that i've purchased for very low price for more than 10 years and every time i was thinking of upgrade, i was thinking again to keep my amp and it's never got upgraded ever since. with tube SETs you may not achieve the desired performance simply because you don't have efficient enough speakers. the most transparent and precise tube amp i've ever heard and not only for your budget, but overall was quicksilver M60 90's model. it's extremely hard to find, but if you get lucky snatch it quick.