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Atma-Sphere S-30

High End OTL Tube Amplifier, 2 x 30 Watts, Mk 3.3

Atma-Sphere S-30 hi-end valve amplifier

The S-30 is the unchallenged state-of-the-art in low power vacuum tube amplifiers. With its simplicity of operation, small footprint, and all the features of our larger amps, the S-30 represents the high-water mark of compact OTL design. 

For those who seek the ultimate in amplifier design the S-30 gives you the same precision and sound quality for which Atma-Sphere is known. Featuring automatic bias and a large VU meter, operation is elegantly simple. 

The S-30 utilises decades-proven patented handwired circuitry so is stable with any load. It performs and sounds better than any single-ended amplifier; a nice choice for a loudspeaker that does not need high power. Its fully-balanced design and proven class-A triode operation makes the S-30 the ideal choice for the discerning audiophile.

FEATURES

- Balanced Differential Design®
- Class-A2 operation
- Patented Circlotronic® direct-coupled (OTL) output stage
- Dual-mono chassis construction
- Automatic bias
- Built in VU meter for tube and output monitoring
- Uses only one gain stage for supreme clarity of sound

- Precision components used throughout
- Low-noise "star" grounding topology
- No circuit boards- hand wired
- Stable (will not oscillate) with all input and load conditions
- Uses only octal triode vacuum tubes
- Classic open chassis construction with Wrinkletex™ finish
- Three-year general coverage warranty, one year warranty on output tubes

Atma-Sphere S-30

Acclaim

Reviews and Awards

Revue Du Son Et Du Home Cinema
Jean Hiraga & Robert Lacrampe, Oct. 2002
Page 1Page 2Page 3

AudioReview.com
Various, user submitted 

Extreme AV
Vangelis Lazarou (in greek) 
Page 1Page 2Page 3Page 4

Output power
30 watts per channel into 8 Ω 
45 watts per channel into 16 Ω

Impedance
Input Impedance: 100 KΩ single-ended, 200 KΩ balanced Output Impedance: 7 Ω

Input
3 V sensitivity
RCA and XLR true balanced input

Tube complement
10 x 6AS7G output tube
6 x 6SN7 driver tube

Gain
23dB (for 8 Ω)

Power Bandwidth
2Hz-75KHz within ½ dB

Frequency response
(1 watt, open loop) 20 Hz squarewave Tilt, unmeasureable
1Hz-200KHz within 3 dB

Hum and noise
Less than -75db below 1 watt,
-95db below full power (30 watts) 

Distortion
Total Harmonic Distortion (THD) typically 1% at full power.
Intermodulation (IM) distortion typically under .04% at full power.
Phase shift less than 1° @ 20KHz 

Output section risetime 
600 V/µs 

Feedback
2 dB

Power consumption
400 watts

Dimensions & Weight
13" deep x 17" wide x 8" tall ( 33 x 43 x 20 cm )
24 lbs ( 10.9 kg ), without tubes

Warranty
Three year general coverage, one year for output tubes

Optional Features

Power Supply Boost option
V-Cap Teflon® coupling caps
V-Cap Copper Foil Teflon® coupling caps
Caddock® resistor package  

Meter Panel finish options

Black Wrinkle
Brushed anodized silver
Brushed anodized gold

Accessories

Jumper plugs for high efficiency speakers - Replaces tube in the voltage amplifier section of Atma-Sphere
power amplifiers, thus reducing gain for high efficiency speakers. Recommended when efficiency of speaker is over 100.

Cables

Balanced Interconnects
Balanced phono cables
1 meter, DIN to XLR or RCA with ground post to XLR 

For additional information, audition and pricing, contact our worldwide dealers or our headquarters.

Address

Atma-Sphere
1742 Selby Avenue
St. Paul, MN 55104
USA

Contact

Email:
ralph@atma-sphere.com
Tel : +1 651-690-2246