Onkyo INTEGRA-A-815 (1978)

Name: Onkyo INTEGRA-A-815
Brand: Onkyo

The Onkyo INTEGRA-A-815 is a vintage integrated receiver produced in the late 1970s, specifically 1978, during the golden era of analog audio equipment. As part of Onkyo’s premium INTEGRA series, the A-815 was designed for audiophiles who demanded high fidelity, robust construction, and comprehensive functionality in a single chassis. This receiver exemplifies the engineering excellence and attention to detail that characterized Japanese audio manufacturers during the 1970s, a time when component stereo systems were at the peak of popularity.

Design and Build Quality

The INTEGRA-A-815 features a classic brushed aluminum front panel with a minimalist yet functional layout. It includes a large central VU meter, which not only serves as a visual indicator of output levels but also adds to the unit’s aesthetic appeal. The meter displays both left and right channel output, allowing users to monitor balance and signal strength in real time. Flanking the meter are large, knurled aluminum knobs for volume, balance, tone controls, and input selection—each providing precise tactile feedback.

The chassis is constructed with a rigid steel frame to minimize vibration and electromagnetic interference, a hallmark of Onkyo’s design philosophy at the time. The rear panel is densely populated with high-quality binding posts for speaker connections, multiple line-level inputs (including phono, tape, tuner, and auxiliary), and tape loop jacks for recording. The build quality is exceptional, with heavy-duty internal wiring, gold-plated connectors, and a generously sized toroidal power transformer that ensures stable power delivery under dynamic load.

Audio Performance

The A-815 delivers 70 watts per channel into 8 ohms, with a total harmonic distortion (THD) of less than 0.05% across the audible frequency range (20Hz–20kHz). This power output was considered substantial in the late 1970s and is still capable of driving a wide range of passive speakers efficiently today. The amplifier section uses a fully discrete transistor design—no integrated circuits—contributing to a warm, natural sound signature that many vintage audio enthusiasts prefer over modern digital amplifiers.

Frequency response is rated from 20Hz to 20kHz ±0.5dB, with extended performance beyond these limits (10Hz–50kHz) at -3dB, indicating excellent transient response and detail retrieval. The signal-to-noise ratio exceeds 90dB, ensuring a quiet background and deep stereo imaging. The A-815 also features a high-quality phono preamp with switchable equalization for both MM (Moving Magnet) and MC (Moving Coil) cartridges, a rare and valuable feature for vinyl enthusiasts.

Tuner Section

The built-in AM/FM tuner is another standout feature of the INTEGRA-A-815. It employs a high-sensitivity dual-ganged varactor tuning system with digital frequency synthesis, providing excellent reception stability and minimal drift. The FM section supports both stereo and mono reception, with a signal strength meter integrated into the main VU display. The tuner is capable of receiving stations from 87.5MHz to 108MHz (FM) and 530kHz to 1600kHz (AM) in 10kHz steps, covering the full broadcast band with precision.

Tuning is accomplished via a large rotary knob with a mechanical dial that provides smooth, accurate station selection. Optional remote tuning units were available for some INTEGRA models, though compatibility with the A-815 is undocumented. The tuner section includes a stereo/mono switch, AF limiter, and local/distance reception modes to optimize performance under varying signal conditions.

Features and Functionality

The INTEGRA-A-815 offers a comprehensive set of features for its era:

Tone Controls: Bass and treble adjustments with ±12dB range at 100Hz and 10kHz, respectively. A loudness contour switch boosts low and high frequencies at lower volumes for more natural listening.
Source Selection: Five inputs (Phono, Tuner, Tape, Aux, CD) with dedicated level controls. The phono input includes switchable RIAA equalization for MM and MC cartridges.
Tape Monitoring: Dual tape loops with independent record and playback monitoring, allowing users to dub between tape decks or monitor the tape output while playing another source.
Speaker Outputs: Dual sets of binding posts (A and B), enabling connection of two pairs of speakers. A front-panel switch allows selection between Speaker A, B, or both.
Headphone Amplifier: A dedicated 1/4" headphone jack on the front panel with its own amplifier circuit, providing high-output drive for a wide range of headphones.
Remote Control: While the A-815 does not have built-in remote control capability, some later INTEGRA models in the series did. No official remote was released for this model.
Muting and Dimmer: A front-panel mute button silences the output instantly, and a dimmer switch adjusts the brightness of the VU meter and tuning display.

Technical Specifications

Power Output: 70W RMS per channel into 8Ω (both channels driven, 20Hz–20kHz, THD <0.05%)
Total Harmonic Distortion: <0.05%
Damping Factor: >100 (1kHz, 8Ω)
Frequency Response: 20Hz–20kHz ±0.5dB
Input Sensitivity:
Phono (MM): 5mV
Phono (MC): 0.5mV
Line: 180mV
Signal-to-Noise Ratio: >90dB (IHF-A weighted)
Tuner Sensitivity (FM): 1.8µV for 26dB SNR
Tuner Selectivity: >70dB at ±400kHz
Headphone Output: 100mW into 8Ω
Power Consumption: 320W (maximum)
Dimensions: 435mm (W) × 156mm (H) × 375mm (D)
Weight: 18.5 kg (approx. 40.8 lbs)

Legacy and Collectibility

The Onkyo INTEGRA-A-815 is now considered a sought-after vintage receiver among audiophiles and collectors. Its combination of high power output, excellent build quality, and warm analog sound makes it a favorite for use in vintage stereo setups. Unlike many modern receivers dominated by digital processing, the A-815 offers a pure, uncolored audio path that highlights the musicality of analog sources.

While not as widely known as some of its contemporaries from brands like Marantz, Pioneer, or Sansui, the INTEGRA-A-815 holds its own in terms of performance and reliability. Onkyo’s reputation for durability means that many units still function perfectly today, especially when properly maintained. Capacitor aging is the most common issue in units that have not been serviced, so a recapping by a qualified technician is recommended for long-term reliability.

In the current vintage audio market, the INTEGRA-A-815 typically sells for $300–$600 depending on condition, originality, and cosmetic finish. Fully restored units with upgraded components can command higher prices, particularly when paired with matching INTEGRA preamps or power amplifiers.

Conclusion

The Onkyo INTEGRA-A-815 stands as a testament to the high standards of Japanese audio engineering in the 1970s. With its robust construction, rich sound, and comprehensive feature set, it remains a compelling choice for anyone building a vintage hi-fi system. Whether you're a vinyl enthusiast, a fan of classic rock, or simply appreciate the craftsmanship of analog electronics, the A-815 delivers an engaging and authentic listening experience that modern gear often struggles to replicate. It’s not just a receiver—it’s a piece of audio history.