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A Tune-up for the Audio Research SP-4/4A Preamp
http://conradhoffman.com/SP4A_caps.htm
A Tune-up for the Audio Research SP-4/4A Preamp. Introduction. The ARC SP-4 preamp was ARCs first solid state preamp. It was controversial at the time and some say it almost destroyed the company. Opinions about the sound quality …
The best sounding Audio Research Line Stage preamp
https://forum.audiogon.com/discussions/the-best-sounding-audio-research-line-stage-preamp
The LS2B MkII, LS3B, LS5 MkII, LS12, LS16 MkII, LS22, and the LS25MkII. Thank you for all your help. If you're looking for the one that has the …
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 SP6 Tube Preamp - Kevin O
http://kevin.kevino.org/tubes/sp6.shtml
Modified Audio Research SP6 Tube Preamp. In July, 2002 I picked up a 1978 Audio Research SP6 preamp. Here is a photo from the original Ebay ad where I found and bid on it. The unit was in very good condition but badly in need of repair. This preamp had an above average power supply with 11 large twist-lok can capacitors.
AUDIO MODIFICATIONS
http://www.high-endaudio.com/Modifications.html
The JP-80 is a straightforward preamplifier, with 6 tubes, all of them 12AX7 types; Three in the phono stage and three in the linestage. The circuit is very similar to the Marantz 7C.The newer MC version of the JP-80 has more tubes in its head-amp circuit, which we will ignore.. The phono stage has two capacitors in the signal path. The first cap is between the first and second tubes.
Audio Classics - Preamplifiers
https://www.audioclassics.com/cat?cat=Preamplifiers
Levinson NO.526 Dual-Mono preamp w DAC phono : List 22000.00 Call 607-766-3501 for availability.
Audio Research
http://www.audioreview.com/brands/audio-research.html
Audio Research. Select the Audio Research product you are looking for or choose a different brand
Audio Research LS-25 Mk I GNSC Ref Mod - Audio Asylum Trader
https://www.audioasylumtrader.com/ca/listing/Preamplifier-Tube/Audio-Research/LS-25-Mk-I/GNSC-Ref-Mod/145884
At the asking price, the Preamp will come with the 4 Siemens 6922 tubes that Steve had included with the mod. I’ve always prefer Amperex tubes ever since I was using LS-1, LS-2…. I had given these Siemens about 10 hours total just to get a flavor, but have primarily used various Amperex tubes from my collection.
audio research - Positive Feedback
https://positive-feedback.com/Issue31/ref3.htm
VPI Scout/JMW 9 tonearm, VPI SDS Controller, ZYX R-1000 Airy 3-XSB phono cartridge, E.A.R. Acute CD player, ModWright Sony 9100 Player with tube power supply, ModWright Sony 9100ES with Signature Truth Modifications, Mod/Bybee Filters and Revelation Cryo Silver Umbilical. Alesis Masterlink 24/96 Recorder/Playback Deck, and the Benchmark DAC 1 ...
Audio Research SP-3, A, & A1 Modification Instructions
http://www.curcioaudio.com/SP-3%20Mod%20Documentation.pdf
Audio Research SP-3, A, & A1 Modification Instructions Page 2 performance of the power supply currently delivered with ARC preamps. The result will be a dramatic increase in the bass and dynamics of the preamplifier. You may apply the modification to any or all of the three sections described – the phono
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