Jonathan Scull

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Pass Labs X1000 monoblock power amplifier
Solid State Power Amp Reviews
Jonathan Scull  |  Jun 06, 2004  |  First Published: Jun 01, 1999
Pass Laboratories' X amplifier series represents the efforts of designer Nelson Pass to prove that simple linear amplifier topologies can be scaled to provide high-quality audio performance at very high power levels. The handsome X1000 monoblock under scrutiny here, the largest and most powerful amp in the Pass stable, makes 1000W into 8 ohms and a mighty 2000W into 4 ohms. The amplifier has no global negative feedback, and only two gain stages: the front-end provides all the voltage gain and feeds a high-current follower stage.
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van den Hul Black Beauty MC phono cartridge
Phono Cartridge Reviews
Jonathan Scull  |  Apr 29, 2007  |  First Published: May 29, 1999
A.J. van den Hul calls the Black Beauty a phono cartridge "just for friends." In a way, this Black Beauty was made specially for me—it's been tweaked for an undamped linear-tracking arm. Says so right here on the box: "Forsell Version." But before you explode, know that Mr. van den Hul will be pleased to do the same for you. He'll adjust the suspension of any Black Beauty– or Grasshopper-series cartridge for your arm and 'table. Or, should you specify, for "the preamp and load impedance, a particular brand of records to be played, the type of music generally played (jazz being more dynamic and classical more spacious and detailed), and other personal/sound preferences."
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Fine Tunes #11
Fine Tunes
Jonathan Scull  |  May 13, 1999
Sometimes you have to sweat the details, sometimes they just fall in your lap. Take Victor Tiscareno. Victor's company, AudioPrism, has been making electronics, accessories, and power-conditioning products for quite some time. While he was visiting and installing a pair of his Mana Reference tube amplifiers for an upcoming review, Victor and I got to talking about power---the kind that comes out of the wall. Victor studied electrical engineering and is very au courant in such matters. During these ruminations he shared with me a recipe for what he calls The Poor Man's Dedicated Line.
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Nagra VPA monoblock power amplifier
Tube Power Amp Reviews
Jonathan Scull  |  Apr 08, 1999
Nagra's VPA amplification system consists of two slim, handsome monoblock amplifiers intended for vertical placement. They look good adjacent to the speakers. However, two 845 tubes put out a lot of heat, so the amplifier should be at least a foot away from your speakers...unless you're looking for a nice crackle finish.
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Fine Tunes #10
Fine Tunes
Jonathan Scull  |  Apr 06, 1999
Last month (click here for previous Fine Tunes) I tipped you on how to check the AC plug orientation for transformer current leakage—the best sound is often found at the lowest voltmeter reading. Roger Skoff of XLO suggests another technique that's worth passing on to you, if only because the imagery is so . . . piquant: Leave the speaker cables hooked up and pull the interconnects from the power amplifier. Turn it on and "stick your head in the speaker," as Roger puts it, checking for the level of hum. (Imagine a pair of bony audiophile legs waving crazily out of the bell of an Avantgarde Acoustics horn speaker.)
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Fine Tunes #9
Fine Tunes
Jonathan Scull  |  Mar 30, 1999
Okay, let's return to the power grid. In the February installment of "Fine Tunes", we learned that typical domestic 110V AC supplies are derived from that 220V transformer out on the pole. The center-tap 110V supply is unbalanced, but if you take 220V service, you're getting balanced power. One thing you can do is take 220V down to 110V with a step-down transformer. George Cardas swears by it. He's also experimenting with a Statpower Technologies Prosine 1000 Full Square Wave Converter hooked to a big mutha battery to power his front-end components.
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Classé Omega power amplifier
Solid State Power Amp Reviews
Jonathan Scull  |  Mar 28, 1999
What fascinates me about the High End are the electric personalities behind it. Manufacturers typically invest so much of themselves in the products they make. It's a divine madness—they do it because they have to. They're driven to it with a real sense of mission and excellence. But God forbid you criticize any of their offspring...ooo-la-la!
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dCS 972 D/D converter
Digital Processor Reviews
Jonathan Scull  |  Feb 27, 1999
I've heard it all a thousand times before:
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Fine Tunes #8
Fine Tunes
Jonathan Scull  |  Feb 23, 1999
Bill Gates would have you believe we live in a plug'n'play world. Apple has proselytized same since day one. But I'm here to tell you it just isn't so for high-end audio. The orientation of a component's AC plug—even the quality of the wall receptacle itself—affects the sound! Oh no, Mr. Bill, not something else to futz with! Will it never end?
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Fine Tunes #7
Fine Tunes
Jonathan Scull  |  Jan 03, 1999
Let's talk cable dressing. Make mine vinaigrette! (And you thought I'd go for French . . . ) Cable dressing is actually a rather delicate issue that requires a certain leap of faith. The concept is so simple that even I can explain the science to you. But the leap occurs when you realize how the positioning of cables and interconnect can make a real difference in the sound of your system. In spite of this, I've seen power cords and interconnects tangled up in a hopeless mess at the back of some pretty serious components.
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