Atma-Sphere MA-1 mkIII Revision 2 tube mono block amplifiers

Atma-Sphere MA-1 MKIII Revision 2  pair mono amplifiers
                                                           

                                          S/N 830 (Pair)

          A very nice example of the MA-1 amplifier likely the best you will find ! 

                                        Selling as a pair of Mono Blocks

                                       The Revision 2 is a $1750 upgrade.

Recipient of The Absolute Sound's prestigious "Golden Ear Award" in 2000, the MA-1 enjoys an enviable reputation. The rugged, non-magnetic chassis features classic looks with superior layout. Setup of the amplifier is simple with it's automatic biasing system. The controls and switches are ergonomic without sacrificing performance. 

The MA-1 is extraordinary in every way. Not only is normal operation easy on the vacuum tubes, the effect of a tube failure on the unit is entirely inconsequential. Despite its extreme performance, the MA-1 is known for remarkable ease of setup, ease of operation, day-to-day consistency and of course extreme musicality. 

 MA-1 shines as an example of why our amplifiers are the best amplifiers worldwide, regardless of cost.

Output power:

140 watts per channel into 8 Ω load
135 watts per channel into 4 Ω load 

Impedance:

Input Impedance: 100 KΩ single-ended, 200 KΩ balanced 
Output Impedance: ~2.3 Ω (power method standard measurement) 

Input:

2.8 V sensitivity 
RCA and XLR true balanced input 

Tube complement:

( per channel ) 14 x 6AS7G output tube 
5 x 6SN7 driver tube 

Gain:

25 dB ( for 8 Ω ) 

Power Bandwidth

2 Hz-200 KHz within ½ dB 

Frequency response:

( 1 watt, open loop ) 20 Hz squarewave Tilt; unmeasureable 
1Hz-300KHz within 3 dB

Distortion:

Total Harmonic Distortion ( THD ) typically 0.5% at full power 
Intermodulation ( IM ) distortion typically under .005% at full power 
Phase shift less than 1° @ 20KHz 

Output section risetime:

600 V/µs 

Power consumption:

( per channel ) 500 watts 

Power Supply storage:

( per channel ) 600 Joules 

Dimensions:

( per chassis ) 18" deep x 17" wide x 8.5" tall ( 46 x 43 x 22 cm ) 

Weinhart Design has lots of other items new and used and if you're in Los Angeles or visiting please accept my invitation to experience our Audio Showroom and please visit 
our ALL NEW & IMPROVED web site @ www.weinhartdesign.com

We are always interested in purchasing quality Audio and Video items, LP collections and most quality trades are welcomed.

If you�re in Los Angeles or visiting please make it a point to visit our new world class Los Angeles showroom by appointment and experience what is possible.

VISA, MC and Paypal are only accepted in the United States and Canada and WE ONLY SHIP to the BILLING ADDRESS or take bank wire transfers.

For transactions using VISA, MC and Paypal we add 3% to cover the costs and onlty ship to billing address UNLESS you are paying by Bank wire transfer..

All sales out of California are State Sales Tax exempt.

California State Sales Tax of 8.75% is only is collected for items received in California.

We accept payments by Bank Wire Transfers and bank checks without fees.

Please call me directly in my world class showroom in Los Angeles 
weekdays @ 310-472-8880 or any reasonable time on my cell including 
weekends @ 310-927-2260 and I can answer your questions and help you 
with all of your new and pre owned needs.

Making Audio Systems better one system at a time,

David Weinhart 

Weinhart Design, Inc. 
President & CEO 
e: [email protected] 
www.weinhartdesign.com 

The Audio and Video Expert

2337 Roscomare Road, Studio #1 
Los Angeles, California 90077 

Showroom) 310-472-8880 
Cell) 310-927-2260