Cary Audio CAD-300SEI

Cary Audio
Introducing the CAD-300SEI: Unmatched Achievements in Amplification

Tube enthusiasts have long been aware that achieving the utmost realism and detail in audio amplification necessitates running an amplifier in Single-Ended Triode (SET) mode. This configuration enables a single power tube to handle both sides of every musical waveform, effectively eliminating the most fatiguing distortions. While it does result in lower output power, especially when paired with high-efficiency speakers played at reasonable volumes, the inherent simplicity of SET mode leads to unparalleled musical naturalness.

The CAD-300SEI is a remarkable amplifier that surpasses the capabilities of almost all other amplifiers available today, despite offering a modest 15 watts of pure class-A remote-controlled power. Its meticulous attention to design and construction ensures an exceptionally quiet operation, allowing even the tiniest musical nuances to emerge against a backdrop of complete silence. This, in turn, enhances your perception of accurate soundstaging and imaging cues, as well as revealing the true harmonic structure of each instrument in the most authentic manner. From distinguishing between a Steinway and a Bösendorfer piano to discerning a Stradivarius from a Guarneri or Amati violin, or even differentiating between a Fender and a Gibson guitar, the CAD-300SEI delivers a level of audio fidelity that reveals inner details within musical ensembles previously unheard. In this case, simplicity reigns supreme, as the CAD-300SEI stands as a testament to the philosophy that sometimes the simplest solution is indeed the best.


"For years I've cavalierly dismissed single-ended tube amplifiers on the basis of their poor measured performance, but the Cary CAD-300SEI integrated amplifier has opened my eyes to the glory of single-ended amplification. The 300SEI was a musical revelation, providing a totally involving and musically euphoric experience night after night. The 300SEI excelled in the most important areas: harmonic rightness, total lack of grain, astonishing transparency, lifelike soundstaging, and a palpability that made the instruments and voices seem to exist in the listening room. Beyond these specific attributes, the 300SEI communicated the musical message in a way that went straight to the heart."
Robert Harley, Stereophile


Product Type: Amplifier

Circuit Type: Single-Ended Class A

Power Output: 15 watts

Input Sensitivity: .42 Volt for full output

Noise and Hum: -90 dB below full output

Frequency Response: 20 Hz to 23 KHz +/- .75 dB

Inputs: CD, AUX1, AUX2, Headphone jack

Tubes: 1 ea – 6SN7 Input, 2 ea – 6SN7 Driver, 2 ea – 300B Output

Power Transformer(s): 1 ea – EI Laminate, 200% Duty Cycle

Output Transformer(s): 2 ea – EI Laminate Air Gap, 200% Duty Cycle

Resistors: 1% Metal Film

Capacitors: Polypropylene Film with hand-soldered copper terminals (optional upgrades available)

Power Supply Capacitors: 2 ea – 1200µF@250 VDC

AC Cord: 3 Conductor, Detachable

AC Power Requirements: 117/234 VAC @ 50/60 Hz

Consumption: 107 watts – Operation

Warm-Up Time: 3 Minutes

Break-In Time: 100 hours of playing time

Finish: Anthracite black chassis with silver or black aluminum faceplate

lwh: 203x356x356

Weight: 23000g

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