Found a pair of good quality KT88 SE pcbs when have a sort through my boxes of parts. No documentation but you'll be able figure it out!
https://www.ebay.co.uk/itm/285434761261
Also added a pair of 12AX7 Sovtek triodes which may suit the board and of course, other power valves could be used.
https://www.ebay.co.uk/itm/285434761261
Also added a pair of 12AX7 Sovtek triodes which may suit the board and of course, other power valves could be used.