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Giving away its professional heritage, the dual-mono Baron has a ground-lift switch for each channel, a guaranteed way of minimizing ground-loop hum. I have no idea why this often essential option is so rare in consumer amplifiers, unless it's a safety/insurance issue. I got the most hum with with one or both channel grounds connected to the system ground, so I lifted them them both for my auditioning.

I spent only a short time listening to my first sample of the Baron, which was dark-sounding as all get-out, especially in triode mode. It turned…

To audition the Baron, I used B&W Silver Signature loudspeakers. Preamplifier was a Mark Levinson No.38S, with a Mod Squad Phono Drive EPS used to amplify LP signals from a Linn Sondek/Cirkus/Trampolin/Lingo/Ekos/Arkiv setup on an ArchiDee table. Digital sources were Mark Levinson No.30.5 HDCD and Parts Connection Assemblage DAC-2 D/A processors driven by a Mark Levinson No.31 transport, a Nagra-D open-reel digital recorder, and a Panasonic SV-3700 DAT recorder via Madrigal and Illuminati AES/EBU cables and Meridian 518 or Genesis Digital Lens jitter-…

Description: Tubed dual-mono power amplifier with output power meters (switchable between 15W FS and 150W FS), "Tandem State Imaging," 4 ohm and 8 ohm output transformer taps, and four selectable levels of overall negative feedback, from 0dB to 8dB. Tube complement: four 12AX7s (input); twelve 5881s (output). Rated output power: about 60Wpc into 8 ohms (17.8dBW) (full triode operation, zero feedback) to 150Wpc into 8 ohms (21.8dBW) (full pentode operation, 8dB feedback). Frequency response, THD, S/N ratio, sensitivity, and output impedance not specified. Input…

As I mentioned in my listening report, the Baron offers 32 different combinations of its settings, meaning that for measurement purposes it is 32 different amplifiers. To supply a full set of measurements for every combination wouldn't leave room in this issue for any other reviews! Accordingly, I only thoroughly measured the Baron's all-triode and all-pentode modes, from both the 8 and 4 ohm transformer taps, with the negative feedback set to none or all (labeled Stage III). Other than spot checks on other settings, I'll leave you to infer what happens for the…

Balanced Audio Technology's Victor Khomenko, late a citizen of Leningrad, emigrated here with his wife Anya in 1979. Most of his working experience has been in the field of instrumentation for the military and aerospace industries. He and soon-to-be partner Steve Bednarski met while pursuing careers at Hewlett-Packard. They found their commonality, high-end…

"...so you do nothing but diet and exercise like crazy; you have no life, but you get down to 160 lbs. Or you don't do anything drastic, enjoy yourself, and wind up at 170 lbs, a little above of your target. Which would you prefer, Jonathan?"

Yup. So BAT builds symmetrical, bipolar power supplies that let their equipment breathe. (Symmetrical means the power supply generates both plus and minus 150V rails rather than relying on the ground—full of schmutz as it often is—for the return…

That would be Patricia Barber's Café Blue LP (Premonition 737). Small adjustments of VTA brought her into astonishing focus and presence. It was a snap finding the balance between sharpness of focus and harmonic…

I began my auditioning with the VK-P10 sitting on its own rubber feet atop a Signature ClampRack. As I began to listen, I mixed and matched components and adjusted gain and loading.

The final optimized playback chain included the Symphonic Line RG-8 on the Forsell Air Force One, XLO 3.1 phono cable with single-ended RCAs at both ends into the P10, then balanced runs of TARA Labs Decade line-level interconnect to the VK-5i preamp. The Forsell Air Force One, after a small service by the factory, was once again spinning its magic tune. (The self-…

Jonathan Scull: Victor, why balanced circuits, if you please?

Victor Khomenko: I remember reading an article that said balanced topology is inherently much more complicated than single-ended. They felt it was a cumbersome way of building circuits. And they provided proof in the form of a very ugly circuit representing "balanced" configuration.

Now, of course, a balanced circuit can be ugly. But that doesn't mean that every balanced circuit has to be like that. On the contrary, when properly implemented, a balanced circuit…

The BAT VK-P10 was measured as delivered: set up for a typical low-output moving-coil. All measurements were made from the balanced inputs to the balanced outputs.

The BAT's voltage gain measured 55dB (1kHz). S/N (ref. 1V) was 64dB from 22Hz to 22kHz, 61.2dB from 10Hz to 500kHz (both unweighted), and 78.7dB A-weighted. Pin 2 of the balanced configuration was positive. The input impedance was 46.7k ohms in the left channel, 47.2k ohms in the right.

Fig.1 shows the VK-P10's frequency response/RIAA error into the Audio Precision System One's 100k ohm…