Try searching the Bottlehead forum (one example linked below with good info on the 2nd page).
Been looking for the same info, but not a lot of hits so far.
I had favorites in vintage Fender guitar amps, but the sonics really don't apply to usage in the Moreplay.
I use good (now expensive) vintage tubes in my old Foreplay/Paramours which IMO makes them sound a lot better, but the tubes were inexpensive when I bought them 20 years go.
https://forum.bottlehead.com/index.php?topic=13298.0
DeKay