Heathkit AD-110
A budget cassette deck that promised reel-to-reel manners, and for a kit, came surprisingly close.
Overview
Heathkit's own catalog copy was blunt about the ambition: a stereo cassette deck "with reel performance." That was a tall claim for 1971, when most people still saw the cassette as a format for dictation and car use, not serious listening. The AD-110 backed it with a frequency response spec of ±3 dB from 30 Hz to 12 kHz typical, and the magazine advertising repeated that figure almost word for word. High Fidelity (September 1971, p.109) ran the deck in its "New from Heath" pages with the same 30 Hz - 12 kHz response. It listed hum and noise at -45 dB, a bias and erase frequency of 110 kHz, and wow and flutter under 0.25% WRMS for both record and playback. For a kit-built cassette machine of the period, those were respectable numbers. They were not studio-grade, but they were a real step up from the hissy portables that gave the format its early reputation.
The transport was the part Heathkit was proudest of, and with reason. The mechanism arrived preassembled and aligned. That removed the most intimidating step in any tape-deck kit: getting the head and capstan geometry right. Buyers still soldered the electronics and wired the controls, but the mechanism came ready to run. Speed was the standard 1⅞ in./s, driven by a solid-state regulated DC motor. According to the catalog it was a two-transistor design, chosen for stable tape speed and minimal wow and flutter. Six pushbuttons handled all transport functions, and a precision counter and automatic motor shutoff rounded out the day-to-day usability.
What set the AD-110 apart from a plain stereo deck was its bias flexibility. The built-in record bias adjustment accommodated the then-new chromium dioxide tape, and it needed no external equipment. The front-panel meter and an internal reference did the work. Heathkit's catalog copy also noted an internally adjustable bias for CrO₂ or standard tapes, so an owner could dial the deck in for whichever formulation they favored. Separate level controls and meters gave independent left/right gain. The deck could record and play stereo or mono through any quality hi-fi system, with Aux inputs spanning 70 mV to 10 V and Mike inputs from 0.2 to 6 mV. That range is wide enough to sit between a turntable preamp and a microphone.
The kit was modest in scope by Heathkit standards. Shipping weight was listed at 11 lbs in one catalog and 10 lbs in others, and the finished unit measured 3⅞ inches high, 13⅞ wide, and 11 deep. That is shallow enough to slot into a shelf or stack. End panels were walnut-stained veneer, which gave it a finished look that hid the solder-it-yourself origins. Power draw was a mere 7 watts from 120/240 VAC at 60/50 Hz. A blank 60-minute cassette came in the box, so the buyer could test the build the moment the last joint was made.
Early catalog listings put the kit at $119.95, and by late 1972 Heathkit advertising had nudged it to $129.95, still firmly in budget territory. For that money a builder got a deck that, on paper, undercut the assembled imports while offering CrO₂ compatibility and a pre-aligned transport. The trade-off was the usual kit bargain: hours of assembly in exchange for the savings, and a machine whose performance depended in part on the quality of the builder's own work.
Collectors run into the AD-110 less often than Heathkit's receivers and amplifiers. Surviving examples tend to show their age in the usual places: belts and idlers that have hardened, heads worn from decades of use, and the occasional cold solder joint from a build done hastily in 1972. The pre-aligned transport helps with restoration, since mechanical alignment is one less variable to chase. Parts are the familiar cassette-deck scavenger hunt rather than anything model-specific. It is not a deck that commands collector premiums.
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