MA-70 Monoblock Amplifiers


Price:
Sale price$120,000.00

Description

If there is one thing that can be said about the MA-70 for certain, it's that it's unique amongst amplifiers. It has a wonderful inner clarity and realism like no other amplifier we know of, at any price.

Operation type:
70 watt 8 ohms, 90 watts 4 ohm Class A/B Current injection construction - a purely current-driven amplifier

Single stage equivalent amplifier

Specifications:
Gain: 60db in current mode
Speed: Slewing rate 400 V/&micro's
Input impedance: 5k
Frequency resonance 1Hz-2MHz
Signal to noise ratio: 120db
Total Harmonic Distortion (THD): 70 watts - less than 0.0001%
Intermodulation Distortion (IMD): Measured with 19 & 20Khz intermixed equally - 0.0005%
Total square wave distortion: Less than 0.001% musical signal under load
Damping Factor: 1000
Channel separation: Infinite
Musical Fast Fourier transform distortion: Less than 0.01% under load

This new amplifier design only amplifies current. It is a current amplifier only, as transistors can only amplify current and are only linear when operated in a current mode.

Current injection is unique. All the transistors inject current into one common line that then drives the speaker. Each transistor is connected to the input instead of to the stage before it, effectively creating a one-stage amplifier.

Magna-drive Transistor treatment is unique to Luminance MA-70 amplifiers. It comes from the technology of Magnetic conditions from High Fidelity Cables and Magnetic Innovations. Magna-drive uses a powerful magnetic field across the transistor to apply powerful lines of flux through the transistor. This helps to guide electrons at the quantum state and gives them a more calculated pathway through the transistor. The result is lower noise, better resolution, and greater dynamics.

Magnetic conduction technology waveguides are used to help deliver signals accurately and cleanly. The equivalent of two Pro Series power cables is used. One to filter the AC power from the secondary of the transformer, and the second to filter the DC power side after rectification. These are used to magnetically and mechanically reduce noise within the amplifier. In all, this helps to make MA-70 one of the most natural and musical amps on the market today.

Mechanically grounded Chassis: The chassis uses a technology known as mechanical grounding. It is designed to eliminate unwanted vibrations and noise. The solid brass base plate and back are designed with complementary footers to quickly eliminate unwanted vibrations for the various parts within the amps. The circuit board and all other components are mounted either directly to these bass plates or via brass connecting rods. The entire amp becomes a sink, to rid the internal components of unwanted vibrations and guide them out to the floor beneath.

Premium audiophile-grade parts: Premium quality hand-picked parts like Texas Instruments Naked Vishay resistors go into each and every amplifier.

Overall, this new amp design is a revelation in thinking. It is truly a new concept and it comes from one of the great designers Steve Keiser. Steve has been an analog circuit designer dating all the way back to early B&K. His circuits of been a revelation in the past and are certainly proving to be once again in our more modern era.

As a general rule, the output impedance of the preamp should be 40 ohms or less. This means most tube preamps won’t drive our amp and most solid-state preamps will. Our amp really works best when driven by a solid-state preamp, like ours.

Also available with a yellow finish.

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