Likewise regarding dealing direct with Dennis about the build specifics.

Also, as I look through the notes I have, I believe if you run the KT88's with a 5AR4 you get closer to 12 wpc in this/my amp. Certainly driving them harder than I thought.

Shipping for me (East Coast) added about $70 RT, so I imagine it is a factor for some who live farther afield.

From what I saw when I opened her up, it involves rewiring the PS in a considerable way. Not just a couple of parts and swapping a wire or two.

Are you sure yours is triode? I ask because you were driving ribbon speakers. :scratch2:

Positive, but as I mentioned, it's only driving above 100hz so the strain is off of the amp for the power hungry spectrum.

MA,

FWIW and YMMV; I had a Parasound A23 for a couple of weeks paired with my ATC SCM 11v2 monitors and was underwhelmed.

Evidently, your speakers are just 85 dB's sensitive. That's a tough job for any amp rated at about 100 watts RMS. Those babies may require much more juice. OTOH, I'm surprised because the A 23 has a 1,000 VA transformer! Plus, these people have been in the audio amplification market for decades.

My speakers are Tekton Lore 2.0, rated at 98 dB's @ 8 Ohms, but I suspect with the impedance curve these are more or less equivalent to 94-95 dBs. Still plenty more sensitive than the SCM 11 v2. The thing is, I listen nearfield in a small room, so I believe in my case it should be enough.

Anyway, how did you like the sound quality of the Halo A 23? Should I go back to the drawing board?

Well, 12 Watts/ch seems to me too much power for a Triode-strapped Firebottle on KT-88's ... But, you may be right. I know my amp running those tubes feels at ease in my small room. The thing is (as in general with all SET's) it sounds wonderful but does not have the "slam" required in certain orchestral passages, especially in classical music.

Got it. :thumbsup:

These electrostatics aren't as difficult to drive as some. They're rated at 91db/1watt.

Everytime I ask Dennis about output expectations, he conveniently answers all my other questions, but neglects to address power output.:scratch2:

I think our perception of output power is more important than the actual measured value. If one of Dennis' amps is clipping a significant amount of the time but its overload characteristics are graceful we preceive its power output as higher than it actually is.

I know that I have had very low (<2wpc) amps that have sounded much more powerful than they actually were.