I have a NYAL Moscode 150. This uses four dual trodes (6CG7, 12AU7) in the front end - driving four MOSFet's per channel - 75 watts output. Designed by George Kaye in the 80's. Superb sounding amp! Tube amps on hand: ARC D75, Dyna ST70 mod, ST70 custom-built by Herb Ward, Heath W5 pair, Paoli/Dyna MkIII pair, Golden Tube SE40, Scott 233, 299, LK72, Stromberg Carlson 6L6 Mono pair, Sanei SA560 2A3 SE, Will Vincent 45 SE, Custom-built 12V6 PP, Harmon Kardon 500, Fisher Symphonic mono receiver, Custom-built Pilot 6L6 PP, Julius Futterman H3AA's and Harvard Music H3 ... plus a few more! As you can see, I have quite a collection of tube amps! And my collection of SS amps is equally large! Variety is the spice of life!