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FOR SALE: Aurora Borealis 845 SE DHT Amp
Audible Improvement’s Aurora Borealis 845 SE DHT amplifier
Based upon a design by Jack Elliano, the Aurora Borealis is a world-class 15 Watt Class A stereo amplifier utilizing the legendary 845 directly-heated triode in single-ended mode. This amp was designed with the concerns and aesthetics for the audiophile in mind, with extra features unavailable even in small production amplifiers.
This amplifier is constructed upon three chassis, one for the power supply (for isolation), plus the left and right channels, each sitting on separate custom-constructed ¼” solid copper plates. Aside from the beauty of solid copper, copper has electrical qualities too, which is the best ground plane for the lowest noise. Having 3 chassis also allows each output chassis to be placed very close the speaker to keep speaker wire as short as possible. The design also has a two-switch turn-on which allows the filaments to heat up first before the B+ plates-- thus preventing cathode stripping in expensive, high voltage 845 tubes. This dramatically extends their life.
The power supply consists of oil caps in the filter supply as well as oil filled by-pass caps on the very large low impedance power supply caps (last cap seen by the front end). This allows for the best of both worlds: low, tight, bass and clear, silky smooth highs.
This two-stage amp provides exceptional musicality, linearity and less than 1% distortion. The front-end tube is the 6HV6; which is coupled to the 845 tube via a parafed 1:1 interstage transformer. The coupling caps are Jensen paper in oil; the speaker connectors are made by Cardas; the ultrapath caps are polypropylene caps and are made by Solen; all signal wire is silver, both in and out. Non-signal wire is silver-coated copper.
Tube life was extended by the two switch turn-on provided on the amp, thus usage was no more than 5% of it's expected life. Therefore, 95% of the tubes life remains.
Please note: For international shipments: all taxes and duties will be paid for by the buyer.
Shipping dimensions are approximate. Final shipping costs will be determined at the time of the sale and by the carrier of your choice.
Jun 07, 17 8:55am
Make an offer: no serious offers refused.
This ad was originally posted on US Audio Mart.
2 chassis, 1 power supply, all tubes, manual.
3 chassis, all double boxed for safety.