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 audiophiles who seek the ultimate in amplifier design and are realistic about their budget, the S-30 gives you the same precision and sound quality that Atma-Sphere is known and recognized for. Featuring automatic bias and a large VU meter, operation is elegantly simple.
And because it utilises patented handwired circuitry proven over three decades, 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
16dB ( for 8 Ω )
Power Bandwidth
2Hz-75KHz within ½ dB
Frequency response
( 1 watt, open loop )
20 Hz squarewave Tilt; unmeasureable
1Hz-100KHz within 3 dB
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.
List Price
$3,990.00
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
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: $60.00/pair
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
(priced per pair)
Balanced Interconnect
2 meter: $130.00
4 meter: $145.00
8 meter: $222.00
Balanced phono cable: $300
1 meter, DIN to XLR or RCA with ground post to XLR
Contact us at (651) 690-2246 or send us an
email.
