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Atma-Sphere S-30 MkII Stereo OTL Amplifier


JustAuBy

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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.  $1600 for forum members, does not include shipping.  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 )

 

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27 minutes ago, Shakeydeal said:

3v input sensitivity? Did I read that right?

 

You must have had a helluva preamp in front of it.

 

Shakey

 

I have a diy Nelson Pass designed BOSOZ balanced pre-amp.  The S-30 was measured at 2.83v input by soundstage.com  It does a shining job and I'm pretty certain i'll have that pre forever.  That being said, I wouldn't recommend a passive pre for this amp.  I've had it going with a lower voltage output pre before and it sounded great, just didn't get the full 30-45 watts of OTL POWAH. 

 

http://www.soundstage.com/revequip/atmasphere_s30mkiii.htm

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