randy11:
"or use a transistor amp (MOSFETS anyone) in a topology that sounds tubey
add a real tubey preamp"
The better class D amps usually do use MOSFETS due to their high quality sound and ability to turn on/off very quickly. MOSFETS are excellent output devices/transistors that sound great and are typically used in the better class A and class D amps.
If natureboy wants a real tubey sound, pairing a real tubey preamp with a class D amp will deliver that sound because they are very neutral and will just faithfully ampify the output of the preamp without any alteration. This is exactly why I recommended this combo to him in my initial post. A VAC preamp paired with a Wyred amp, or any similarly good class D amp, would likely be a very good solution.
Natureboy,
I think a Vac pre-amp properly matched in impedance to a good class D amp and connected with quality XLR interconnects, would result in a sound very similar to your Avatar but with significantly more power. Most good class D amps offer no risk in-home trial periods of up to 30 days. If you're not satisfied, you can return it at no, or a minimal, charge.
If you decide on this route, I'm fairly certain you'll get plenty of good suggestions here on this thread concerning which amp to match to your preamp choice if you request assistance. Again, my opinion is that a VAC preamp is a great choice but almost any preamp you choose can probably be matched to a good amp within your budget..
Thanks,
Tim