CH Precision A1 POWER AMPLIFIER

World Class CH Precision A1 Stereo Amplifier offered at a greatly reduced price.   The A1 incorporates a host of novel and unique circuit designs and technologies that make this a Swiss marvel.  Some of the unique topology is noted below.  
The central power supply takes up most of the internal space of the chassis.  A huge 1200VA transformer is mounted on silent blocks and shielded both with a magnetic and electrostatic screen.  
All the analog stages are built only with discrete components.  No op amps are used. No capacitors have been used in the signal path nor any output relays to ensure maximum transparency.  
A gain stage of 24db, with steps of 0.5db, is embedded into each channel for a perfect match with the loudspeaker's sensitivity and room size.  A lower gain is typically preferred for high sensitivity speakers into a small room,  while a higher gain is sometimes needed for larger rooms with low sensitivity speakers.  
 The A1 output stage can be configured to have varying levels of global feedback. The global feedback versus local feedback ratio is adjustable on-the-fly from the front user's interface.  Each step is 20%, going from 0% local feedback only up to 100%.  
Much more information can be had from the CH Precision web site.  
Balanced and Single-ended input options.  
Brief comments from various audio reviews:
From Positive Feedback:
 Compared to other amps I've tried, dynamic range seems to be without limitation. 

The A1 also has resolution like you've never heard...

The sound quality achieved was at the pinnacle.

From HiFi Plus and The Absolute Sound:  

The CH Precision D1, C1, and A1 are in our Formula One; precision products, custom made for uncompromising users to deliver the ultimate performance. This top elite remain an ultimate, a goal towards which we should all strive, even if not all of us can reach it. And that’s the thing; CH Precision is one of that select list of products we as audiophiles should try at least once in our lives. And for a lucky few (who not only have the financial clout, but are prepared to take time to learn how to really use the system), they get to live with one of the best systems ever.

The ‘no-quarter’ build quality extends throughout.

CH Precision’s ‘thing’ is one of gradually winning over the listener. It’s impressive by not being impressive, although there’s some of the typically Goldmund ‘writ large’ presentation about the overall sound. But more importantly, it’s one of those systems that defies description, because the flexibility allows it to adapt to the demands of the loudspeaker so well, it becomes something of a shape-shifter. It does the big, bold Wilson loudspeaker signature sound, but when you move from Wilson to Wilson-Benesch, it delivers the kind of tight, controlled, and authoritative sound you expect from Wilson-Benesch. And when you plug in a pair of loudspeakers that don’t have the word ‘Wilson’ in their name, CH Precision adapts to them too.

A1 power amplifier

Inputs: Balanced: 2x XLR
Single-ended: 2x RCA, 2x BNC

Power output: 2x 100W/eight ohms (stereo), 1x  350W/eight ohms (bridged)

Bandwidth: DC-450kHz (-3dB)/1W/8Ω

Dimensions (WxHxD): 440x120x440mm

Weight: 43kg