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Seta Model L phono preamplifier Measurements

Sidebar 3: Measurements

I measured the Seta Model L with Stereophile's loan sample of the Audio Precision SYS2722 system (see the January 2008 "As We See It" and www.ap.com). I experimented with the grounding between the preamp and the analyzers to get the lowest level of noise. To fully charge the Model L's batteries, I left it plugged into the wall overnight. It ran off battery power for the measurements.

All the Model L preamplifier's inputs and outputs preserved absolute polarity; ie, were non-inverting. However, there was a problem with the right channel's Flat output. While…

Seta Nano phono preamplifier

The minuscule electrical output of an analog signal from a moving-coil cartridge needs to be boosted before it can be converted to digital and equalized in the digital domain. Of course, you could use your current phono preamplifier and record an equalized signal to hard disk, but then you wouldn't get to experience Pure Vinyl's digital RIAA correction—nor would you be able to avail yourself of all the equalization curves provide by Pure Vinyl, of which there are almost too many to count.

When I first wrote about Pure Vinyl in the March 2009 "Analog Corner," Robinson recommended…

Seta Nano phono preamplifier Specifications

Sidebar 1: Specifications

Description: Solid-state phono preamplifier with flat and RIAA-equalized inputs. Inputs: XLR (balanced); RCA (functions as single-ended/balanced adapter). Outputs: Flat signal, XLR (balanced); RIAA Corrected (switchable to Flat) on single-ended RCAs. RIAA compensation curve accuracy: ±0.1dB, 20Hz–20kHz. RIAA compensation curve channel match: ±0.02dB, 20Hz–20kHz. Switchable RIAA high-pass filter: 10Hz, 12dB/octave, –0.3dB at 20Hz. Voltage Gain: 47dB (flat output): 60dB (RIAA). Frequency Response: DC–8MHz, –3dB (Flat Outputs, Balanced Input, with MC Cartridge…

Seta Nano phono preamplifier Associated Equipment

Sidebar 2: Associated Equipment

Analog Sources: Continuum Audio Labs Caliburn, Cobra, Castellon turntable, tonearm, stand; Graham Phantom II tonearm; Ortofon A90, ZYX R1000 Sigma 2 cartridges.
Digital Sources: Playback Designs MPS-5 SACD/CD player, Camelot Roundtable Anagram Technologies DAC, BPT-modified Alesis Masterlink hard-disk recorder, Sooloos music server, Macintosh G5 computer with Lynx L22 soundcard.
Preamplification: Abbingdon Music Research PH-77, Boulder Amplifiers 1008 & 2008, Vitus Audio MP-P201 phono preamplifiers; darTZeel NHB-18ns preamplifier.
Power…

Seta Nano phono preamplifier Measurements

Sidebar 3: Measurements

I measured the Seta Nano phono preamplifier with Stereophile's loan sample of the Audio Precision SYS2722 system (see the January 2008 "As We See It" and www.ap.com). I experimented with the grounding between the preamp and the analyzers to get the lowest level of noise.

Housed in an enclosure the size and proportions of an Apple Mac mini computer, the Nano crowds together pairs of balanced and unbalanced inputs and outputs on its rear panel, as well as rotary switches for adjusting the resistive loading of each channel, a ground terminal, and a trimmer to…

Pure Vinyl LP recording & editing software

As long as you're spinning an LP for your listening pleasure, and if digitizing it at a resolution of 24-bit/192kHz is transparent to the analog source, why not record and store the LP on your computer at that high sampling rate for future convenient playback via iTunes or for iPod use, or for burning to CD-R? And, while you're at it, why not record the LP unequalized and apply the RIAA curve in the digital domain, where you're not dependent on capacitors and resistors that are imprecise to begin with, and can drift over time? With no drift of phase or value, the virtual filter's results…

Pure Vinyl LP recording & editing software Page 2

Before you do anything, go into Pure Vinyl's Preferences, where you'll be presented with the first set of maddening choices, some of them incomprehensible to all but the most technically informed. Most important is "Apply vinyl correction curve." The recording itself will be "flat." In other words, the input is to be recorded unaltered, whether with or without EQ. You are selecting the output for both monitoring and playback. Here you can choose from among 66 different curves, for both 78rpm and LP playback.

If you record an equalized signal from your standard phono preamp, be…

Pure Vinyl LP recording & editing software Page 3

Normal playback with Pure Vinyl was always stable. It was only when I was changing configurations, or during rendering operations, that I ran into potentially speaker-damaging problems. According to Robinson, most audiophiles using the software have a dedicated audio computer, which he recommends as the safest way to use his software.

For serious listening, do you really want to digitize analog?
Everything you're about to read needs to be considered in the context of the $675 Lynx L22 soundcard, thought by many to be among the best of its type. However, it's usable in the Intel…

Pure Vinyl LP recording & editing software Specifications

Sidebar 1: Specifications

Description: Macintosh program (requires OS10.5 or later) to rip LPs and edit the resultant files. Offers RIAA and other deemphasis curves.
Price: $299. Pure Music alone: $129. Approximate number of dealers: Sold direct.
Manufacturer: Channel D, Trenton, NJ. Tel: (609) 393-3600. Web: www.channld.com.

Bo Christensen

Bo Christensen, who was the guiding light behind, first, Primare, then Bow Technologies, graduated as an architect—not surprising, considering his products' drop-dead-gorgeous looks. I talked with Bo while preparing my review of his Bow Technologies ZZ-Eight CD player (see Stereophile, August 1998, Vol.21 No.8), and started by asking him if his knowledge of electronics was self-taught.

Bo Christensen: I don't have much knowledge of electronics. I have a design team, we have a listening panel, so it's teamwork where I contribute ideas...it's a team effort where the circuitry is designed by…