Had a swatch on Ebay as the best sounding i.m.o. and longest lasting KT88s I've ever had in my Audiopax were a quad of Sovtek from Hotrox for £110 about 4 years ago. Last quad of Electro Harmonix ok..ish but two now replaced with the old Sovteks as the EH's were becoming 'dubious'. Tried JJs, EATs, a few quads of EH and the Holy Grail GECs. Let's say unimpressed. New quad of Sovteks (supposedly out of production)from a mob called Solsound. Rather dubious about the Red print but shell shocked at their asking price 600 quid???? Maybe just risk a quad of quads of the Red Lions,lol.