Sorry I didn’t have the time so far to give the promised overview over my impressions of the brands which I know quite or very good (compared to just a short listen, which I certainly also had of some newer models of the brands). Now on holidays I managed to write a bit.
I named the component of the respective brand, my characterization is mainly based upon. It’s often an older one meanwhile, but mostly basic characteristics don’t change fundamentally. Anyway certain weaknesses will certainly have improved with later models.
I listed strengths under ++ and negative or weaker points under – in relation to the relevant price level and other competitors.
I used !! behind unusually strong characteristics
Where characteristics are not mentioned, they are on usual high level for the price range.
So here my subjective (with the attempt to be objective), quick characterization. Everyone’s welcome to disagree or discuss where necessary.
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Pass Aleph 0 monos
++
speed
transparency
prat
vivid bass
some tube like vividness, airiness, realness (surprising for a ss amp)
—
slam
rich tonal colors
.
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Threshold Stasis SA2 mono power amps
+/-
similar to Pass Aleph 0 with less pronounced positives
.
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Hovland HP 100MC tube preamp:
++
tube typical vividness, airiness, realness
top end extension, detail and quality!!
transparency
vivid bass
—
slam/impact
dynamics
.
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Brinkmann mono power amps
++
speed
control
neutrality
—
no tube typical vividness, airiness, realness
emotional impact
tonal colors
.
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Gryphon prototype stereo power amp (quasi modded Antileon), Electra preamp, Orestes phono amp
++
impact/slam
emotional impact!!
tonal colors and harmonic structure (especially in bass)!!
resolution!!
extension
enveloping imaging
ease
makes worse recordings sound better, feels like having a sub (in a positive way) without having one connected
—
no vivid bass
prat
neutrality
speed
no tube like vividness, airiness, realness
.
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Vitus prototype stereo power amp
+/-
*similar to Gryphon with less emotional impact and harmonic structure in bass. Also with similar but clearly less pronounced weaknesses
*Vitus uses much better parts than Gryphon and several others, but is also quite a bit more expensive
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Lamm M1.1 hybrid tube mono amps
+/-
similar to Vitus with some tube typical vividness, airiness, realness
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Boulder 2060 stereo power amp
++
*seems perfect in most characteristics
*neutral
—
*no tube like vividness, airiness, realness
*the setup either has to be perfect or one has to care for some emotional, euphonic character elsewhere
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Octave HP500MC hybrid tube preamp
++
tube typical vividness, airiness, realness
soundstaging
—
resolution
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Halcro DM10 preamp
++
neutrality
transparency
—
no tube typical vividness, airiness, realness
tonal colors/harmonic structure/emotion
liveliness
.
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Audio Note Kondo KSL M7 tube preamp
++
tube typical vividness, airiness, realness
transparency!!
soundstaging
prat
—
dynamics/energy
impact/slam
only little tonal richness
.
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Einstein The Preamp (tube)
++
tube typical vividness, airiness, realness
dynamics!!
energy, punch, liveliness!!
speed
control
prat
3D/air!!
—
no clear weakness identified except that transparency is not on Audio Note Kondo level