I owned one of these magnificent systems. I taught me so much about valve electronics that I nearly ended up working for Quad.
Vinyl after dark denied because my Mission Cyrus amplifier has no headphone output. I need something to connect to the tape out RCA sockets. I considered DIY, but it would have cost as much as a bought one to make anything that looked half decent. Research showed that a valve amp could be had for the same price as a solid state one. So, for about £30, I got me this.