Talking about Leak Hi-Fi amps, a friend sold me a Leak TL50+using a pair of KT88s, for five quid. I had a pre-amp chassis and engraved front panel made for me in work. I built a one valve pre-amp, essentially the Normal channel circuit from a Fender Bassman, into this chassis and, connected to the Leaks pre-amp socket, it sounded wonderful through a Marshall 4x12 100W cabinet. I used that set up for quite a while before moving on to something different.