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.
Because it utilises decades-proven patented handwired circuitry, it is stable with any load and both performs and
sounds better than any single-ended amplifier ever produced, let alone conventional push-pull designs. Its fully-balanced
design and proven class-A triode operation make the S-30 the ideal choice for the discriminating audiophile.
- Balanced Differential Design®
- Class-A operation
- Patented Circlotronic® direct-coupled (OTL) output stage
- Dual-mono chassis construction
- Automatic bias - no adjustment needed
- Built in VU meter for tube and output monitoring
- Easily monostrapped for greatly increased power
- Uses only one gain stage for supreme clarity of sound
- Proprietary precision components used throughout
- Low-noise "star" grounding topology
- Fully hand-wired point-to-point electronics - no circuit boards!
- Stable with all input and load conditions
- Exclusively uses Octal-Triode based vacuum tubes
- Classic open chassis construction with Wrinkletex™ finish
- Three-year general coverage warranty, one year warranty on output tubes
Output power
30 watts per channel into 8 Ω load
45 watts per channel into 16 Ω load
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
13" deep x 17" wide x 8" tall ( 33 x 43 x 20 cm )
Weight
( without tubes )
24 lbs ( 10.9 kg )
Warranty
Three year general coverage
One year for output tubes
For all support requests, or any questions about your Atma-Sphere product, contact us directly at (651) 690-2246 or send us an
email.
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
Gray hammertone
Brushed anodized black
Brushed anodized silver
Brushed anodized gold
Custom finishes available upon request
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
Pricing
Contact your local
dealer for pricing information.
Or, call (651) 690-2246 or
email us with any questions.
