Great thread topic George.
Having been a fan of Solid state and being dismissive of all tube gear for the majority of the first few years in this hobby, I am a complete convert to tubes, well more specifically into Hybrids.
I do find full tube gear to be too warm and sweet to my ears, lacking the bottom end punch that very few tube amps manage to have.
Hybrids have struck a chord in me in finding the right balance by drawing the best of both worlds.
I alternate between the 3 Cavalli Audio amps I have built, and you guessed it, they are all hybrids. The Compact tube hybrid (CTH) which is a pint sized power house..very unassuming to the eye but a perfect amp for an office setup. Uses a single dual triode (i personally use an RCA 6CG7 cleartop) for the front end and a simple bt powerful solid state buffer for the output stage.
The EHHA, embedded hybrid headphone amplifier, a fully DC coupled transconductance amplifier with great current driving abilities, the most powerful of the amps I have in my possession. A step up from the CTH. I run a pair of 6H30P-DR supertubes for the input stage and IRF MOSFETs for the output stage.
And the stacker headphone amp/preamp, another hybrid amp, the best of the lot by far. This beast is magical in every sense and is the best headphone amp I have heard thus far in any price range. Again run a pair of RCA cleartops in this but has great tube rolling oportunities, both noval and octal (6SN7, 12SN7, 12Sn7, 6F8G, etc).
On a side note..going to get the opportunity to listen to this next week at the local stereo shop.
Reference 610T Monaural Vacuum Tube Amplifier by Audio Research
Going to be epic
