Burson Audio Timekeeper
I take it for granted that a vast majority of the folks who're into high-end hi-fi is aware of Burson Audio's headphone amps and other products, including desktop sized Timekeeper stereo power amp, with 2 x 80W true Class AB power.
No ICs on the board, a 300W custom-built transformer and a linear power supply with 40,000uF of power reserve, the CNC machined aluminium enclosure/heat-sink, and both RCA and XLR inputs. That's the Timekeeper.
I have nothing worthwhile to comment on its technical realization, nor on its appearance; everything seems to be in order: THD (1khz @ 8 Ohm) less than 0.03%, frequency response 0hz – 50Khz (+/-3Db), and SNR better than 98dBax. 240 mV is required to run the amp with max power, and input impedance offered to the preamp is 20Kohms.
I use the opportunity just to report briefly how I "felt" the Timekeeper behaved with a selection of loudspeakers with which I've been able to "test" the amp's potential in recent months. Speakers include a handful of standmount 2-way monitors, including eg. Audio Note AX Two; at least two floorstanders: Penaudio's new Rebel Three and ProAc's Response D20/R; plus two or three widebanders.
Here's one happy companion: EM Acoustics EMS-51.
Most of the time I had not one but two Timekeepers on board. In the bridge mode they deliver total of 230W of power. Among the loudspeakers there was none that would've shown signs of insufficient power by the side of Timekeepers, not alone but even less when bridged. On the other hand, I think it's descriptive of the Timekeeper that as a couple it doesn't sound that much more powerful than as a single. The addition is of a more sophisticated type.
In my experience the sound didn't seem super fast in a sense that all turns in music would have received a split-second answer; yet music was pulsating nicely with the music's broader rhythmic considerations. In this respect Timekeepers reminded me of my old 2x200W Sony integrated that in other respects was more unsubtle.
There was no excessive warmth and roundness in bass (as can happen with some powerful transistor amps), nor Class-D/Class-T type of sense of control. Highs were definitely not what sometimes can be heard with Class D/T realizations, but more natural and largely indiscernible.
All in all I got the impression that the Timekeeper is like a prestigious work horse; it knows what it's doing, and does it with some self-esteem.