Heathkit AR-13A

Name: Heathkit AR-13A
Brand: Heathkit

Forty-six transistors, a gold-anodized face, and a kit price that undercut the factory-wired competition by half.

Overview

The Heathkit AR-13A was the company's all-transistor receiver, released into a market still dominated by tubes. The chassis carried 46 transistors and 17 diodes. It had two 33-watt power amplifiers, two preamplifiers, and a wideband AM/FM/FM stereo tuner, all in a compact walnut cabinet built in Heath's low-silhouette motif. Heath rated the receiver at 66 watts IHF music power and 40 watts RMS from 15 to 30,000 Hz at ±1 dB. The company also published per-channel figures under its own "Heath Rating": 20 watts into an 8-ohm load, 13.5 watts into 16 ohms, and 9 watts into 4 ohms. IHF music power output was listed at 33 watts into 8 ohms. The transformer power supply was there to hold full power at each frequency, and Heath leaned on that heavily in its catalog copy.

The tuner section got real attention. The AM side used a high-gain RF stage and a high-Q rod antenna. The FM side had a built-in line-cord antenna plus external antenna connectors. A local-distance switch handled strong-signal overload, AFC kept tuning drift-free, and a tuning meter and lighted AM and FM slide-rule dials helped with station-finding. The built-in stereo demodulator switched to stereo automatically and lit the stereo indicator when it did. The tape recorder outputs were filtered for what Heath called "beat-free" recording. Three stereo inputs covered magnetic phono and two auxiliary sources. Dual-tandem controls handled volume, bass, and treble across both channels, with a separate balance control.

Builders got a break on the hardest parts. The FM front-end and the AM-FM I.F. strip arrived preassembled and prealigned, which removed the two alignment jobs most likely to defeat a first-time kit builder. Secondary controls sat under a hinged lower front section of the gold-anodized aluminum panel, so nobody changed system settings by accident. The walnut cabinet was included at no extra charge. The kit AR-13A weighed 35 pounds and sold for $184.00, with an export model available for 115/230 VAC, 50-60 cps operation. Heath exempted the AR-13A (along with the AR-14) from the company's 5% special system discount, so buyers couldn't shave the price by bundling it into a complete system order.

The contemporary press took the receiver seriously. Julian D. Hirsch, writing in the November 1965 issue of HiFi/Stereo Review, called it "one of the finest integrated stereo receivers I have seen, comparable to many factory-wired tuners costing far more." Hirsch singled out low IM distortion at low power levels - a common weakness in early transistor amplifiers - plus a remarkably flat power response, inaudible hum and noise, good FM sensitivity, negligible drift, and excellent FM stereo channel separation. Electronics World reported that despite its low price the AR-13A was one of the best stereo receivers the magazine had tested and comparable to many manufactured units costing twice as much. A period Radio-TV Experimenter piece framed it on value grounds, calling it a rock-bottom dollar buy and about the best one could hope for in the solid-state market place. Heath's own advertising billed the receiver as an exceptional value at a kit price of $99.95 in the AR-14's case. That is not the AR-13A's $184.00 figure, since the two receivers shared catalog pages but not price tags.

Heath's pitch was the transistor argument itself. Its copy promised cool, instant operation free from heat, long dependable life since transistors don't deteriorate, and lower power consumption than tube designs. The company described these characteristics as unobtainable in tube types. Whether or not every claim aged well, the receiver's measured behavior backed the important ones. Hirsch found the low-level distortion performance that tube-era skeptics doubted solid-state could deliver.

The AR-13A sits alongside the AR-14 in the catalog as one of the two receivers Heath excluded from system discounts, which suggests the company knew how thin the margins were on these all-transistor designs. The gold-anodized panel and walnut case have held up better than many kit-built chassis of the era. The preassembled front-end and I.F. strip mean a working example is less likely to have been butchered by a previous owner's alignment attempts than a fully self-aligned kit would be. The 35-pound weight and compact footprint make it easy to shelf, and the concealed secondary controls keep the front panel clean.

The rated outputs tell you what to expect. Twenty watts per channel into 8 ohms is honest mid-sixties kit power - enough for efficient speakers, not enough to wake inefficient ones. The 4-ohm rating of 9 watts per channel under Heath's own measurement standard is notably conservative, and the 16-ohm figure of 13.5 watts reflects the transformer-coupled design's behavior across loads. Heath recommended pairing the AR-13A with its AS-2U or AS-2A acoustic suspension speaker systems, both of which used Acoustic Research drivers and were rated for 20 to 40 watts RMS. The AS-2A added a dome super tweeter to extend response to 20,000 Hz and carried a recommended minimum amplifier power of 20 watts, which lines up with the AR-13A's 8-ohm rating.

Expect the usual kit-built caveats: solder joints of varying quality, aged electrolytics, and the possibility that a previous owner substituted parts during a repair. With 46 transistors, a failure anywhere in the signal path can be tedious to trace without a schematic, though Heath's documentation was thorough and remains widely circulated. The prealigned front-end is a real advantage, since the FM section is less likely to need a realignment than one the builder aligned by hand. Because the walnut cabinet came with the kit, original examples usually turn up complete rather than missing their case.

What the AR-13A represents, more than any single specification, is Heathkit's bet that transistors could win the receiver market on merit rather than novelty. The company put its money behind that bet by exempting the receiver from discounts — a signal that the price was already as low as it could go. Reviewers at the time agreed the math worked. Hirsch's verdict that it compared to factory-wired tuners costing far more, and Electronics World's finding that it matched units at twice the price, both point to the same conclusion: the AR-13A was a kit that didn't ask to be graded on a curve.