Jeff Rowland Model 112 Stereo Power Amplifier

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Great match to either of the Rowland preamps we currently have in stock.

150W per side, XLR or RCA capable, built out of a solid block of aluminum, and made in Colorado.

Jeff Rowland Desgin Group is still in business and servicing all of their products too.

In great cosmetic condition with a gorgeous machined turned finish.

Fully tested, sorted out and working perfectly.

Please see the linked manual below or our last photo for full specifications.

Jeff Rowland Model 112 Stereo Power Amplifier Manual

Product Features:
• XLR input connectors for balanced (Differential Mode) system configuration.
• RCA input Connectors for unbalanced system configurations.
• Selectable overall gain of 26 or 32 dB.
• User selectable switching between balanced and unbalanced connections.
• 12V remote ON/OFF power switching connector.
• Automatic temperature stabilizing circuitry maintains constant operating temperature.
• CE approved speaker output connectors requiring no tools for tight connections.
• Automatic bias adjustment maintains optimal bias setting regardless of source material or loudspeaker load.
• Standby power condition reduces warm-up time.
• Fail-safe operation provided by user-resetable thermal circuit
breakers located on rear panel.
• Quiet, transient-free operation during power and function mode switching.
• Automatic input muting under anomalous input or output operating conditions.
• Fully-balanced Differential Mode circuit topology implemented from input to output.
• Low resonance, structurally integrated chassis constructed of precision-machined aircraft grade aluminum.

The SkyFi Testing Process for Solid State Amplifiers:

We start with a visual inspection of all internal components to make sure there are no signs of stress or aging. Capacitors are checked for telltale sings of bulging or leaking, resistors are checked for signs of overheating or cracking, and transistors are checked for signs of stress or damage.

We then power up the unit carefully and run a simple 1k sine wave while monitoring the output on an oscilloscope for signs of distortion or noise. Finally, we run the amplifier to its full rated power into the appropriate resistive load provided by our Sencore amplifier tester. If there is an issue, it will usually be noticeable at this point. If everything reads clean, we will often test for THD (Total Harmonic Distortion) measured by our Keithley distortion meter, and compare it against the original manufacturers specifications. The amplifier then remains powered on to "burn in" on our test bench for a few hours to make sure there are no heat related issues. If there are balanced inputs available they will be also be tested.

Final testing involves pushing actual music thorough the amplifier. We've learned over time that some issues are only noticeable to a trained ear while listening to familiar source material. Our test bench has reference vintage KEF speakers that we're very familiar with which quickly reveal any discrepancies. Some amplifiers will then move into our listening room where they are tested with our in-house reference speakers of choice.

Please click here for detailed specifics regarding our specialized packing process that separates us from the rest.