Solid State Preamp Reviews

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TEAC UD-701N streaming D/A preamplifier

In Gramophone Dreams #88, I described the sound of TEAC's VRDS-701T CD transport as "dense and precise in a way I had never previously heard from digital." I went on to explain, "by 'dense,' I mean there was a tangible corporeality effected by seemingly infinite quantities of small, tightly packed molecules of musical information."

What I noticed most during the review period was the extraordinary volume of data the 701T was vacuuming off those pits and lands and turning into music. As I have gotten to know it better, what I've noticed most is how the 701T sorts and delivers all that data in a manner that makes every DAC I pair it with sound more corporal and dynamic.

As I wrote that review, I wondered how the 701T would perform partnered with its matching UD-701N converter/streamer/preamplifier and how the TEAC flagship DAC's sound character would compare to flagship DACs from HoloAudio, Denafrips, and dCS.

The Mod Squad Line Drive passive preamplifier

The Mod Squad Line Drive System Control Center is a purely passive stereo switching unit with a volume and balance control, five line inputs, and additional facilities for two tape decks. It allows the audiophile to replace a preamp, with its active gain stages—and resulting coloration—with a device that introduces no distortion or coloration other than that in the wiring, switches, and controls.

Threshold FET 10 preamplifier

This product is a pre-trol. What, you may well ask, is a "pre-trol?" Well, Threshold Corp. calls its FET-10 a preamplifier, but it isn't, really. In fact, it isn't an It at all; it's a Them. Only half of Them is a preamp, and you can buy each half separately. If that sounds a little confusing, maybe it's because some of the old, familiar language of audio is starting to lose its relevance.

Threshold FET Nine/e preamplifier

The Threshold FET nine/e ($2595) is the junior sibling of the FET ten/e, a solid-state preamp that has earned a rave review in March 1991 from noted tubeophile Dick Olsher (Vol.14 No.3), itself a development of the FET ten that J. Gordon Holt reviewed in September 1987 (Vol.10 No.6). Would my ears, accustomed as they are to the pitter-patter of electrons traveling through a vacuum, have a similarly positive response to the FET nine/e?

Threshold T2 preamplifier

Threshold is one of the longest-surviving high-end audio companies. Founded in the 1970s by Nelson">http://www.stereophile.com/interviews/1191pass">Nelson Pass and René Besne, it was acquired by a large, publicly traded corporation in 1988. This had both positive and negative results in that Threshold was then able to expand its activities, adding the cost-effective Forté line of products, but energies were drained away from cutting-edge design. Besne left the company in 1991, while Pass resigned in 1992 to pursue other interests. (These blossomed into the Pass Aleph 0 amplifier reviewed by DO in March '95, Vol.18 No.3.)

Topping Pre90 line preamplifier

There has not been a conventional preamplifier in my main audio system for quite a while, because no multichannel preamp is available that's of high enough quality. Instead, I use the high-precision digital volume controls in my players and DACs and choose sources with a relay-based multichannel analog switch. Plus, I tell myself that no preamp can be more accurate and transparent than no preamp.
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