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Audio Research SP3 1970s Pre Amplifier | Strictly Discs ...
https://reverb.com/item/38582245-audio-research-sp3-1970s-pre-amplifier
Audio Research SP3 Pre-Amplifier Recently Serviced and working up to spec with main output Telefunken Tubes, the rest are early Yugoslavia tubes. Vacuum-tube stereo preamplifier. Frequency response: 15Hz-30kHz, ±1dB. Distortion (THD): 0.005% at 5V out. Maximum output: 25V at 1kHz. S/N Ratio:...
History of Audio and Phono Preamps 1970 to 1989 ...
https://www.darlingtonlabs.com/audio-history/blog-post-title-two-3nr8k-f9g8b
J. Gordon Holt reported that H/K had a policy of continual improvement, and he felt these updates caused it to be the best sounding preamp for the discerning audio enthusiast, short of the all-tube Audio Research SP-3, in the mid-1970s. 1972 - Russell O. Hamm publishes “Tubes Vs. Transistors”, his famous Audio Engineering Society paper.
Audio Research SP-3 preamplifier – Old School | TONEAudio ...
https://www.tonepublications.com/old-school/audio-research-sp-3-preamplifier/
Audio Research SP-3 preamplifier Back in the mid 1970s, the idea that a preamplifier could provide “straight wire with gain” was an elusive goal. The idea that such perfection could be achieved from a valve model seemed even more unlikely.
This 1970s audio system sounds better than what you're ...
https://www.cnet.com/tech/home-entertainment/this-1970s-audio-system-sounds-better-than-what-youre-listening-to-today/
The Audio Research SP-3-A preamp (top), Audio Research D-150 (bottom). Fernando Zorrilla The speakers were the magnificent and very large Tannoy Ardens from the mid-1970s, which feature a gigantic...
1970's Audio Research Equipment, worth having?
https://forum.audiogon.com/discussions/1970-s-audio-research-equipment-worth-having
The D-79 and D-150 which were originally developed in the 1970's are classic/collectable Audio Research designs and hold up fairly well when compared to later units. I always felt the D-50, D-51 D-75, D-76, D-90, and D-160 had that "soft tube" sound and lack the high definition of the D-70, D-115 and D-250 series.
Our Story - Audio Research
https://audioresearch.com/our-story/
Late 70’s Early 80’s and 90’s Following the success of the SP-3, and amplifiers like the D-150, Audio Research was able to grow both in terms of size and product offerings. Bill continued to focus on his mission to offer new products driven by their musical performance as opposed to market-driven features.
Audio Research – High-end audio equipment
https://audioresearch.com/
Preamplifiers. Audio Research has produced some of the finest components for music reproduction; this is especially true with regard to preamplifiers. In 1973, the SP3 was hailed as the best preamplifier available, and this tradition of excellence has continued ever since. The Reference Series from Audio Research was first introduced in 1995 ...
Audio Research Home Audio Amplifiers and Preamps - …
https://www.ebay.com/b/Audio-Research-Home-Audio-Amplifiers-and-Preamps/14970/bn_57330410
Audio Research SP-11 preamplifier - Stereophile.com
https://www.stereophile.com/tubepreamps/898/index.html
In 1970, Bill quit Peploe, bought back his patents from them, and restarted his own manufacturing facility under the name of Audio Research Corp. That was five years after the first solid-state audio electronics had started to appear; by 1970 there was hardly a single tubed component to be found in Stereo Review 's annual Equipment Directory.
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