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AUDIO RESEARCH SP6a
https://www.audioantiquary.com/en-us/audio-research-sp6a/
The device is sold with 6 Russian production tubes. If you want to make a significant leap in quality we can install a sextet of ECC83 original NOS Telefunken selected and coupled by us visible in the photo gallery. The price of the pre SP6a refers to the original valves, if you want the upgrade to the German valves 800.00 euros must be added.
Audio Research SP6a DC on output | diyAudio
https://www.diyaudio.com/community/threads/audio-research-sp6a-dc-on-output.838/
HI I have recently bought an Audio Research SP6a preamp and very happy with it generally. There is however a problem with it when powering it on and off. It get a large amount of DC as the woofers make a very unnatural noise and the cones go forward for quite a few seconds and then gradually go back to their resting position.
Audio Research SP6A Vacuum Tube Preamp | Tube | Audiogon
https://www.audiogon.com/listings/tube-audio-research-sp6a-vacuum-tube-preamp-2017-09-21-amplifiers
Audio Research SP6A for sale. Fully vacuum tube preamplifier from ARC with tube phono stage. This preamp is offered on behalf of Austin Stereo Service in Austin Texas. As with all the gear we sell, the electrolytic capacitors h...
Audio Research SP6 Tube Preamp - Kevin O
http://kevin.kevino.org/tubes/sp6.shtml
The speakers were Acoustic Research 312HO's with all of the original wiring and crossovers removed. The cabinets were stiffened by adding additional bracing. The preamp drove a passive two-way crossover with a 200Hz turnover frequency. The low pass side of the crossover was 3rd order and the high pass side was 1st order.
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 ...
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