[the S-30 MkII]: "...Silky smooth with unparalleled transparency..."

After numerous requests for a lower-powered amplifier, we unveiled the S-30 at the HiFi '99 show in Chicago, where it was warmly received (Sam Tellig comments in the August '99 STEREOPHILE: "I lust after this amp"). The S-30 Mk3.1 improves on the success of it predecessors, is even more compact and easier to use. It is the unchallenged state-of-the-art in low power tube amplifiers. The S-30 Mk3.1 is easy to live with, operate and has the same features as our larger amplifiers.

For audiophiles who seek the ultimate in amplifier design and are realistic about their budget, the S-30 gives you the same precision and performance which has garnered Atma-Sphere's awards. Operation is simple- bias is automatic. The tubes and output power of the amplifier are monitored with the large VU meter. The amp is stable with any load and uses patented handwired circuitry proven over 3 decades. Built with octal-base signal triodes and a classic appearance, the S-30 outperforms and sounds better than any single-ended amplifier ever produced, not to mention conventional push-pull designs. Its fully-balanced circuitry and proven class-A triode operation make the S-30 the ideal choice for the discriminating audiophile.

FEATURES:

• exclusively octal triode-based, vacuum tube circuitry
• class-A operation
• patented Circlotronic® direct-coupled (OTL) output stage
• Balanced Differential Design®
• dual-mono construction
• automatic bias
• built in VU meter for tube and output monitoring
• easily monostrapped for greatly increased power
• simple, reliable circuit; only 1 stage of gain employed
• XLR and RCA input connectors
• proprietary precision components used throughout
• low-noise "star" ground circuit
• fully hand wired point to point!
• classic open chassis construction with Wrinkletex finish
• three-year general coverage warranty, one year on output tubes

OPTIONS

Power Supply Boost option - $400
• V-Cap Teflon® coupling caps $500
• Caddock® Resistors $1270
• Meter panel color options: anodized brushed gold, black or silver, no charge

SPECIFICATIONS:

• 30 watts/ch into 8-ohm load/45 watts into 16-ohm load
• power bandwidth: 2Hz-75KHz within 1/2 db
• frequency response (1 watt): 1Hz-100KHz within 3 dB
• THD typically 1% at full power
• IM distortion typically under .04% at full power
• phase shift: less than 1 degree @ 20KHz
• input impedance: 100K single-ended, 200K balanced
• output section risetime: 600V/micro-sec.
• stability: stable with all loads and inputs
• feedback: 2db
• power consumption: 400 watts
• tube complement: 10) 6AS7G output tube
• 6) 6SN7 driver tube
• dimensions: 13" L x 17" W x 8" H