Amta-Sphere

Atma-Sphere music systems, inc. is a small company in Saint Paul, MN that has been making world-class vacuum tube music amplifiers since 1976. We are known for our unique approach to circuit design, resulting in multiple patents and the creation of the first, truly reliable Output TransformerLess (OTL) amplifiers.

Atma-Sphere S-30 Mk III.1

Atma-Sphere S-30 MK III.1 Stereo OTL Amplifier – $3,990. Good OTL amps are just expensive to make… complexity from the power supply to the number of tubes requires drives up cost, but Ralph Karsten at Atma-Sphere has put together a great sounding hand-wired 30W/Ch OTL that cut no corners in a category where such (OTL) amps cost much more.The fully balanced, very stable & reliable design delivers the purity of tube tone that no other type of amplifier can. Click here to view manufacturer web page for the S-30 MKIII.1.

Optional Features:

Power Supply Boost option: $400
V-Cap Teflon® coupling caps: $500
V-Cap Copper Foil Teflon® coupling caps: $600
Caddock® resistor package: $1270

Amplifier

Signature Sound High-End Audio

posted 3 weeks ago

Some of the other things we do here at Signature Sound High-End Audio. For you Merlin Music Systems speaker fans/owners I am working on improvements/upgrades to the BAM and am testing a prototype Master BAM with a number of mods in it right now. One the test/work bench - a Joule Electra LA300ME that I have implemented a (improved version) of the Joule-Electra Platinum Upgrade on that is undergoing some further burn-in after initial listing and technical tests/checks.

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Signature Sound High-End Audio

posted 3 weeks ago

After much anticipation, Cardas Audio has finally announced the new Clear Beyond Power XL power cord. This new top of the line cord is a step above the Clear Beyond cord in their product line-up. We should have some of these available for demo by the end of February. Having been very impressed with the sound, performance, and modest cost of the Clear Beyond cord, the Beyond XL cord should be a excellent performers, especially for power amplifier (including larger integrated amps) and power conditioners. Pricing starts at $2,480 for a 1.5m (5ft) cord.

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Signature Sound High-End Audio

posted 3 weeks ago

Not a great pic, but wanted to show/tell folks after some listening and evaluation, Signature Sound will be carrying the Audioquest Niagara line of power conditioners. Very well built, outlets that grip plugs with kung-fu grip, very effective power conditioning/ filtering, and good sound make them a winner in my book. A good replacement for the Running Springs Audio (now out of business) units I have been using for some years (for which our demo units will be up for sale soon).

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Signature Sound High-End Audio

posted 1 month ago

There is a very nice review in the recent Stereophile Magazine of the Rega Research RP10 turntable by Michael Fremer. A PDF of the full review can be viewed here: https://drive.google.com/file/d/0B738RhYqgou7TjRqaHlEQW9VeUlZa1lZeGxvTXhSRnU3YVln/view

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Signature Sound High-End Audio

posted 1 month ago

A fresh trade-in from a local customer, this Rega RP6 with Rega Exact MM phono cartridge is in very good condition. Its 4 years old and only $1,050 plus shipping.

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