Spatial Coherence TVA-1 preamplifier Specifications

Sidebar 2: Specifications

Description: Full-function solid-state preamplifier with two phono inputs, three line-level inputs, two tape loops with selectable two-way dubbing. Original published specifications: Frequency response: 10Hz–40kHz +0, –0.5dB. Max output: 10V. THD: 0.05%. IMD: 0.05%. Phono S/N ratio: 80dB. Measured performance (footnote 1): RIAA accuracy: R channel, –0.25dB at 20Hz, –0.75dB at 20kHz (net: ±1dB); L channel, –0.25dB at 20Hz, –0.25dB at 20kHz (net: ±0.5dB). Line level frequency response: R channel, 20Hz–30kHz, +0dB, –0.1dB; L channel, 20Hz–30kHz, +0.5dB, –0.1dB. Phono S/N ratio, ref. to 2.5V output: R channel, 92dB (input shorted), 89dB (input open); L channel, 94dB (input shorted), 90dB (input open). Phono crosstalk: R channel, –64dB, L channel, –67dB. S/N ratio, line level, ref. to 2.5V output: R: 90dB (input shorted), 89dB (input open); L: 90dB (input shorted), 89dB (input open). S/N ratio, line level, ref. to 10V output: R: greater than 102dB; L: greater than 102dB. Crosstalk, line level: R: –57.5dB; L: –55dB. THD: L channel, 0.01% at 20Hz, 100Hz, 1kHz, 0.017% at 10kHz, 0.045% at 20kHz, 0.12% at 30kHz; R channel, 0.005% at 20Hz, 100Hz, 1kHz, 0.001% at 10kHz, 0.03% at 20kHz, 0.07% at 30kHz. IMD: R channel, 0.07%; L channel, 0.0035%.
Dimensions: 3.5" H by 19" W by 14" D. Weight: 22lb.
Original price: $1395. Used price: $350.
Manufacturer: Spatial, Inc., Long Beach, CA 90807 (no longer in business, 1989).


Footnote 1: The technical tests were performed after a one-hour warmup, using a Sound Technology 1701 distortion analyzer.

COMPANY INFO
Spatial, Inc.
Long Beach, CA 90807
(no longer in business, 1989)
ARTICLE CONTENTS

COMMENTS
dial's picture

Saw one for sale once in an online vintage shop, they say it performs at high level, like today gear. It was sold quickly.
Also nice to see you used "cheap" but excellent cartridges to test the phono like the Ortofon X 5 (I own the 3, still excellent !).
I have more pics of this unit if wanted.

s10sondek's picture

I want to express my ongoing gratitude for Stereophile's regular posting of these archival reviews. No other HiFi journal that I know of appears committed to making available such an exhaustive database of subjective and objective information in this domain. It really sets Stereophile apart from the crowd.

These vintage reviews are extremely helpful because: 1) They show truly how far we've come over the decades in terms of performance and value, particularly when it comes to loudspeakers and budget electronics, 2) They show how the art and science of product evaluation has evolved over that same time period, 3) They remind us of the vastly different demeanors and values of Stereophile's reporters, from the stone-cold analytical aspect of A.J. Cordesman, to the irrelevant zany antics of C. Greenberg, to the effusive warmth of H. Reichert, 4) They serve as a guide for those just getting started in this hobby to navigate the secondhand market for bargains they can afford.

It's a shame that the similarly rigorous HiFi News archives are much more spotty; there's surely a treasure-trove of information and wisdom to be gleaned from that long-crusing Mother Ship of objective/subjective review hybridization. The same is true of the long-lost measurement troves of Audio, Stereo Review, and High Fidelity -- like 'em or not, they each contributed vast amounts of objective data to the hobby that is now on the verge of being forgotten.

Given how central a rigorously-kept library is to all aspects of intellectual pursuit, it is sad that in HiFi, we seem to be lacking our Library of Alexandria or even just something resembling a decent University Library. Stereophile is the closest thing to that we've got.

Without a clear link to the past, we are infants newly-born and blinking blankly at the present, only able to rely on our personal experiences, unable to receive the knowledge of those before us. Having a cadre of seasoned audiophiles on your masthead keeps Stereophile from suffering this fate. And curating the knowledge gleaned from giants like JGH, LG, RH, and TJN (to name a few) is the other thing that keeps today's Stereophile anchored in the context of the past.

I appreciate what you do. Thank you.

John Atkinson's picture
s10sondek wrote:
I want to express my ongoing gratitude for Stereophile's regular posting of these archival reviews. No other HiFi journal that I know of appears committed to making available such an exhaustive database of subjective and objective information in this domain. It really sets Stereophile apart from the crowd.

Thanks very much for your comment, s10sondek. When we started to post Stereophile's content to the magazine's free-access website in December 1998, my goal was eventually to have every equipment report, regular column, and both technical and music feature articles posted, going back to very first issue in November 1962. More than two decades later we still have a ways to go - although I stepped down as Stereophile's editor at the end of March 2019, I am grateful to AVTech and editor Jim Austin for agreeing that I can continue preparing the magazine's content to be posted to the website.

John Atkinson
Technical Editor, Stereophile

X