[quote name='alexclaber' timestamp='1366116694' post='2048480']
If you want an all-valve sound without the weight, try to find a Warwick Quadruplet preamp. This has a tiny valve power amp and output transformer running a dummy load, and then a low current signal is taken from that to the preamp's output. They did heads too, which used the same preamp and then had a powerful solidstate power stage. I think there are some other designs like this but I can't think of them off the top of my head.
[/quote]
The MESA Walkabout... and it sounds gorgeous t'boot. Some say it's the tubiest hybrid, and IME I have to agree.