You can use big power tubes in a pre-amp. Remember a preamp is just a low power control amplifier. It's a bit of overkill because a preamp doesn't need to make the kind of power a large power tube can produce. No idea on the sound quality though.
KT150s in a Preamp Design?
I'm a bit of a shade tree tube amp mechanic; I'm no expert and have a decent but not comprehensive knowledge of design. Can someone tell me what's going on with this tube preamplifier design? I've never seen KT150s in a preamplifier!
http://www.thebestamp.com/Tube_Pre-Amps/Reference_Series/Reference-3.php
Calling Atmasphere!
http://www.thebestamp.com/Tube_Pre-Amps/Reference_Series/Reference-3.php
Calling Atmasphere!