For sale is my Atma-Sphere S-30 MII OTL amplifier. I've purchased a set of Atma-Sphere M-60 Mk. 3.3 Mono blocks so this one needs a new home. I'll include 15 additional Shuguang 6AS7G NOS tubes as well. $1700 plus shipping. Located near St. Louis, MO for pickup. Specs below:
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 )
