SR-71B, Fully balanced portable amp

Emmeline SR-71B – Quad mono fully balanced, input-output, portable amp.

There is nothing out there to even come close to what the SR-71B can offer. The state of the art fully differential input to output with best audio specs ever when it comes to low noise, bandwidth, slew rate & dynamics. Four independent op-amps with the lowest input noise & excellent audio performance are used in the gain stages, two for each channel giving you three independent gains per channel. The Buffer stage has four independent buffers, two per channel with a great drive capability & current handling. Making this portable balanced amp the most powerful Amp ever designed. The topology of four independent mono channels make it unique & a must hear to believe. There is no headphone ever made that SR-71B can’t drive with great authority & control. It will stand toe to toe with best balanced home amps out there. It can swing in balanced mode more than 26V p-p. SR-71B uses, custom designed for RSA, four Lithium Ion battery pack that when fully charged you have 16.8 volts DC. SR-71B can swing more than 12-14 volts p-p in single ended, making it excellent performer to drive HD 600/650.

We have implemented a custom designed “Alps” volume control with four independent resistive sections, two for each channel, with dual shafts, each two resistive sections are controlled by one shaft. This will give many listeners out there the ability to balance the left & right channels independently according to their hearing. You might not believe this but more than 80% of the people can’t equally hear from both ears. Also many analog players might not give you equally balanced signals. Music files might not have been recorded with perfect left & right amplitude of signal strength, this dual mono high quality POTs configuration makes it a great feature for many out there.

SR-71B has both fully balanced input signal that is processed that way from the input to output, and the single ended 3.5mm input connector. We use 2 balanced connectors, the same as the Protector’s balanced connector. One is for the balanced input signal, on the rear panel, the second is on the front panel, for the balanced output. Balanced input signal from any true balanced player will be handled all the way through in fully balanced till it reaches the balanced headphone output connector. The single ended headphone jack will still be active BUT it will carry only single ended signal.

SR-71B handles the single ended signal in a different way. The fully balanced differential chip converts the single ended signal into a balanced signal with opposite polarity. This signal is passed to four independent gain stages then to four buffers. This means your balanced outputs connector will ALWAYS have balanced signal at output no matter what the input signal is and ALWAYAS have the single ended signal at the 3.5mm headphone jack no matter what input signal might be.

Ten of the BEST state of the art op-amps & buffers are being used in the design. No compromise in quality of resistors or caps. Mil spec PC board well implemented components location & lanes makes this design having the lowest noise floor ever built. All these chips are high voltage chips used in the best sound reproduction components.

With all that much circuitry, dual pots, double gain switches, two balanced connectors, two SE connectors, balanced & SE switch selector, DC input jack, on/off LED & on/off switch, this balanced amp must be real big in size, right? The truth is that it is shorter than SR-71A by ½”, 3.25” in length, .7” in height & 2.25” in width. This is a portable amp that has it all, Quality in workmanship, sound reproduction and all that your heart desires in bells & whistles, all in a small portable package.

RSA

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