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

Heathkit sold affordable build-it-yourself kits for ham radio gear, test equipment and home audio systems. Hobbyists learned electronics by assembling working, high-quality devices. The AS-136 was one of their modest audio offerings, a compact passive loudspeaker system introduced in the mid-1970s. It was not a high-power audiophile flagship. It was an accessible entry point into quality sound for the budget-minded tinkerer.

The AS-136 was designed as a bookshelf or desktop speaker. It was marketed to people building complete audio systems from scratch - often paired with Heathkit's own amplifiers like the AA-135 or AR-1720. As a passive speaker, it needed an external amplifier and had no active electronics, which fit the minimalist, cost-effective approach of much of the Heathkit line. It never reached the status of contemporaries like the AR-3 or KLH Model Eight, but vintage audio collectors and DIY historians still hold a quiet affection for it.

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.

Specification	Detail
Type	Passive 2-way bookshelf speaker
Drivers	6.5" woofer, 1" dome tweeter
Frequency Response	Approximately 60 Hz – 18 kHz
Sensitivity	~86 dB (1W/1m)
Nominal Impedance	8 ohms
Crossover Frequency	~3.5 kHz
Enclosure Type	Sealed (acoustic suspension)
Dimensions (HxWxD)	13" × 8" × 8.5" (33 × 20.3 × 21.6 cm)
Weight	~12 lbs (5.4 kg) per cabinet
Recommended Amp Power	10–50 watts
Crossover	2nd-order low-pass, 1st-order high-pass

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 has a balanced, somewhat reserved sound. The sealed enclosure gives clean, articulate bass, though it rolls off below 60 Hz. That is no surprise for a speaker this size. The 6.5" woofer handles midbass with modest authority. That suits vocals, acoustic sets and jazz, but it is less ideal for orchestral or electronic music that demands deep bass.

The 1" dome tweeter has a smooth high-frequency response and avoids the harshness that plagued some budget speakers of the 1970s. Cymbals and string overtones come through with clarity, though the top end lacks the airiness of more premium designs. The crossover at 3.5 kHz hands off cleanly between the drivers and gives a coherent midrange, which helps vocal clarity.

Overall, the AS-136 sounds warm and slightly laid-back. It won't impress with dynamic slam or wide soundstaging, but it offers honest, fatigue-free listening for background music, FM radio or late-night record sessions. It does best with a tube amplifier or a vintage solid-state receiver, where it comes across as a modest but musical performer that favors coherence over spectacle.

Notable Features and Innovations

The AS-136 was not groundbreaking in design, but it showed 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.

It was not innovative in the technical sense. It did follow Heathkit's mission of making quality audio accessible through education and self-reliance.

Common Issues and Maintenance

Like any vintage speaker, the AS-136 may need 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 fairly straightforward because the design is accessible. Replacement parts, especially for the drivers, turn up occasionally through vintage audio suppliers or online forums. DIY enthusiasts often restore AS-136s as a nostalgic project, sometimes upgrading the crossover or adding damping material for better sound.

Current Market Value and Collectibility

The Heathkit AS-136 is not a high-value collector's item, but it has 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.

Nostalgia drives collectibility more than sound does. 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.

The AS-136 is not a must-have for serious audiophiles. It dates from a time when building your own stereo system was both economical and educational.

Conclusion and Legacy

The Heathkit AS-136 may not be the most powerful or refined speaker of the 1970s. It came out of the DIY movement, and it pushed a generation to engage with technology and build skills that lasted a lifetime.

Today the AS-136 works as a functional speaker and a historical curiosity. For anyone restoring a vintage setup or wanting a simple speaker for casual use, it remains a worthy, if humble, choice.

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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