Tube Amp for Green Mountain Audio Callisto

I would make sure whatever amps you choose have a "zero-negative feedback" option or are simply "zero-negative feedback" amps. Roy's design is both time and phase-aligned, so, personally, I'd only put hardware in front of my Callistos that also maintain the time-domain integrity of the audio signal.

I have only use Ayre hardware with my Callistos, but I have owned a set of AES Sixpacs and thought they sounded great. You can run these amps with zero-negative feedback. They only have a couple of drawbacks - they produce a bit of heat and with 12 EL-34 power tubes, they ain't cheap to re-tube. That being said, if I was in the market for tube monoblocks, the AES Sixpacs would be on my shortlist.

In my fantasy world where I have a system in each and every room of my house, one system would contain a fully tricked-out Cary SLP-98P and a custom set of Sixpacs painted to compltely match the pre-amp. I think that would be a cool setup.

One more thing to note about the Sixpacs: There is a lot of iron in each monoblock. If you've not lifted one, you'll be surprised exactly how heavy each amp is. New they are a bargain. Used they are a steal. Make sure they are packed *really* well.

If you decided to consider SS integrated, put the Ayre on your short list.

Wow...sorry for another post.

Sixpacs are on sale at MusicDirect.com for $1,750.00