Audio Research

Audio Research SD135 Stereo Power Amplifier; Silver; Upgraded Power Cable

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Product: Audio Research SD135 Stereo Power Amplifier; Silver; Upgraded Power Cable

Product SKU: 33976

Serial Number: 27204006

Voltage: 120V

Cosmetic Description: 9/10 Excellent condition with no notable blemishes. 

What is Included: Amplifier, Manual, Shunyata Venom HC 20 Amp 10 gauge power cable, Factory packaging

Functional Notes: Operational condition of this item is excellent, fully tested and no issues found.

Age: Unknown

# of Owners: 3

Tobacco Exposure: No

Service History: None

MSRP: $4995

Other Notes: "The SD135 is an entirely new amplifier for Audio Research involving a new mix of discrete devices within the framework of a pure analog, solid-state design.

Like the larger HD220, the new SD135 ("SD" for "Silicon Drive") uses Thermal Trak® self-biasing output devices in a Class A-B design. And like the HD220, it accommodates either single-ended or balanced inputs. But unlike the larger hybrid, the SD135 features an all-solid-state input stage using multiple JFET devices in each channel, directly driving the output stage – no interstage coupling capacitors needed. Because expensive coupling capacitors and high voltage regulated supplies required in tube circuits can be omitted, the SD135 is within reach of many more music-lovers." - Audio Research

Product Specifications


Shipping: Cost to ship this item within the contiguous United States is a flat rate of $85- including packaging and insurance. For all other locations including Hawaii, Puerto Rico and Alaska, please request a quote prior to purchase. Items with factory packaging will be double boxed. When factory packaging not available re-usable shipping box with custom injected-foam mold will be used. (for all items over 10 lbs). Note that all items valued over $750 will require a signature upon delivery.