Heathkit AS-136: The DIY Enthusiast’s Compact Speaker Solution

In the golden era of do-it-yourself electronics, few names carried as much weight as Heathkit. Renowned for offering affordable, build-it-yourself kits that spanned ham radio gear, test equipment, and home audio systems, Heathkit empowered hobbyists to learn electronics while assembling functional, high-quality devices. Among their modest but practical audio offerings was the AS-136, a compact passive loudspeaker system introduced in the mid-1970s. Though not a high-power audiophile flagship, the AS-136 represented an accessible entry point into quality sound reproduction for the budget-minded tinkerer.

Designed as a bookshelf or desktop speaker, the AS-136 was marketed toward those building complete audio systems from scratch—often pairing with Heathkit’s own amplifiers like the AA-135 or AR-1720. As a passive speaker, it required an external amplifier and offered no active electronics, aligning with the minimalist, cost-effective philosophy that defined much of Heathkit’s product line. While it never achieved the legendary status of some contemporaries like the AR-3 or KLH Model Eight, the AS-136 holds a quiet charm for vintage audio collectors and DIY historians.

Technical Specifications

The AS-136 was engineered for simplicity and ease of assembly, featuring a two-way design with modest sensitivity and a compact footprint ideal for small listening environments.

The cabinet was constructed from medium-density fiberboard (MDF) with a walnut-veneer finish, typical of the era. Assembly required careful attention to driver mounting, crossover wiring, and baffle alignment—standard for kit-based speakers. The sealed enclosure design provided tight, controlled bass response, albeit with limited low-end extension, making the AS-136 best suited for nearfield listening or small rooms.

Sound Characteristics and Performance

The AS-136 delivers a balanced, if somewhat reserved, sonic signature. Thanks to its sealed enclosure, bass is clean and articulate, though it rolls off below 60 Hz—unsurprising for a speaker of its size. The 6.5" woofer handles midbass with modest authority, making it suitable for vocals, acoustic sets, and jazz, but less ideal for orchestral or electronic music demanding deep bass.

The 1" dome tweeter provides a smooth high-frequency response, avoiding the harshness that plagued some budget speakers of the 1970s. Cymbals and string overtones are rendered with clarity, though the top end lacks the airiness of more premium designs. The crossover at 3.5 kHz ensures a seamless handoff between drivers, contributing to a coherent midrange—crucial for vocal clarity.

Overall, the AS-136 presents a warm, slightly laid-back tonal balance. It won’t impress with dynamic slam or wide soundstaging, but it offers honest, fatigue-free listening—perfect for background music, FM radio, or late-night record sessions. When paired with a tube amplifier or a vintage solid-state receiver, the AS-136 reveals its true character: a modest but musical performer that prioritizes coherence over spectacle.

Notable Features and Innovations

While not groundbreaking in design, the AS-136 embodied several hallmarks of Heathkit’s philosophy:

• Kit-Based Assembly: The AS-136 arrived as a parts kit with detailed instructions, allowing users to learn speaker construction, soldering, and acoustic principles. This hands-on experience was a major draw for hobbyists.
• Modular Design: Components were standardized and clearly labeled, reducing assembly errors. The crossover used point-to-point wiring on a terminal board, making repairs and modifications straightforward.
• Cost-Effective Engineering: By using off-the-shelf drivers and simple crossover topology, Heathkit kept costs low without sacrificing basic performance.
• Aesthetic Simplicity: The walnut veneer and minimalist baffle design gave the AS-136 a clean, unobtrusive look that blended well with 1970s home decor.

Though not innovative in the technical sense, the AS-136 exemplified Heathkit’s mission: to make quality audio accessible through education and self-reliance.

Common Issues and Maintenance

As with any vintage speaker, the AS-136 may require restoration after decades of use. Common issues include:

• Aged Foam Surrounds: The woofer’s foam edges often degrade over time, leading to flaking and loss of bass response. Re-foaming or reconing is typically necessary for optimal performance.
• Tweeter Failure: The dome tweeter, while durable, can suffer from voice coil burnout if overdriven or mismatched with high-gain amplifiers.
• Crossover Component Drift: Electrolytic capacitors in the crossover may dry out, altering frequency balance. Replacing these with modern equivalents can restore clarity.
• Cabinet Damage: Scratches, dents, or veneer lifting are common. Gentle refinishing or touch-up pens can improve appearance without devaluing the unit.

Maintenance is relatively straightforward due to the accessible design. Replacement parts—especially for the drivers—are occasionally available through vintage audio suppliers or online forums. DIY enthusiasts often enjoy restoring AS-136s as a nostalgic project, sometimes upgrading the crossover or adding damping material for improved sound.

Current Market Value and Collectibility

The Heathkit AS-136 is not a high-value collector’s item, but it holds niche appeal. In original, working condition, a pair typically sells for $75–$150, depending on cosmetic state and restoration quality. Fully restored units with re-foamed drivers and upgraded crossovers may command slightly more, especially when paired with matching Heathkit electronics.

Collectibility is driven more by nostalgia than sonic performance. Heathkit fans, vintage audio hobbyists, and DIY culture enthusiasts are the primary market. Complete kits with original manuals and packaging are rare and can fetch premium prices from completists.

While not a “must-have” for serious audiophiles, the AS-136 is a charming artifact of a time when building your own stereo system was both economical and educational. It represents a bygone era of hands-on electronics—where the journey of assembly was as rewarding as the music itself.

Conclusion and Legacy

The Heathkit AS-136 may not be the most powerful or refined speaker of the 1970s, but it occupies a special place in the history of consumer audio. As a product of the DIY movement, it empowered a generation to engage deeply with technology, fostering skills and appreciation that lasted a lifetime.

Today, the AS-136 serves as both a functional speaker and a historical curiosity—a reminder that great sound doesn’t always come from high-end gear, but from the passion and care invested in the listening experience. For those restoring a vintage setup or seeking a simple, honest speaker for casual use, the AS-136 remains a worthy, if humble, companion.

In the world of vintage audio, where legends are often defined by specs and price tags, the Heathkit AS-136 stands as a quiet testament to the joy of building, learning, and listening—one solder joint at a time.

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Related Models

• Heathkit AA-32 (1972)
• Heathkit AA-100 (1957)
• Heathkit AA-121 (1972)
• Heathkit AA-40 (1970)
• Heathkit AD-17 (1976)
• Akai AM-2850 (1975)
• Akai AP-206 (1975)
• Nakamichi BX-1 (1985)
• Acoustic Research research-ar-17 (1978)
• Acoustic Research AR-19 (1994)