Akai AP-306 (1978–1980)

Akai's quartz-locked direct-drive deck from the tail end of the Japanese turntable wars, built to hold speed with a 314 mm die-cast platter and a self-lubricating motor.

Overview

The AP-306 has a 314 mm aluminum alloy die-cast platter on a quartz-locked direct-drive motor, in a package that measures 440 x 158 x 350 mm. It's Akai's answer to the speed-stability obsession of the late-1970s turntable market. It's a 2-speed direct-drive turntable made in Japan, produced from 1978 to 1980, and it sits near the top of Akai's own range from that period. The chassis is wide and shallow, and fits a standard component shelf.

The drive system pairs a DC servo motor with quartz lock speed control. The motor is self-lubricating, which Akai's own documentation frames as removing the need for additional lubrication during normal operation. That's a handy detail on a forty-plus-year-old deck bought sight unseen. The platter is die-cast aluminum alloy, not stamped steel, so it has real mass and resists warping.

Speeds are 33 and 45 rpm with a pitch control range of ±2.5%, and the speed accuracy spec is quoted at 1,000 Hz ±0.08%. Wow and flutter runs 0.035% per DIN (0.025% per JIS), and rumble is rated better than 70 dB. Those numbers put the AP-306 in serious territory for its era. Not esoteric, but well beyond what a casual listener would need.

Key Features

Quartz-Locked Direct Drive with DC Servo Motor

The AP-306's core is a quartz-locked direct-drive system built around a DC servo motor. The service manual for the AP-306 also covers the AP-206, and the two share a direct-drive PC board design. The AP-306/C adds a PLL (phase-locked loop) board on top of the AP-206/C's frequency-generator circuit. That PLL board holds both the quartz lock circuit and the stroboscope circuit. In practice, the neon strobe lamp flashes in synchronism with a frequency counted down from a crystal oscillator, rather than being triggered by the AC line as it is on the AP-206/C. The speed reference doesn't drift with household voltage.

The motor itself is self-lubricating. Akai's documentation states it eliminates the need for additional lubrication during normal operation. On a direct-drive deck that's a long-term reliability point: no belt to stretch, no idler wheel to harden, no periodic oiling to forget.

Auto-Return Tonearm with Anti-Skate

The tonearm is a static-balanced type with an anti-skating adjuster, 220 mm effective length, 15 mm overhang, and an offset angle of 22°30'. Horizontal tracking error is quoted at ±2°. The arm accepts cartridges from 4 to 12 grams, which is a wide window, broad enough for most moving-magnet and many moving-coil cartridges without needing a sub-weight. Stylus pressure adjusts from 0 to 3 grams, and the arm lifter is oil-damped for controlled cueing. The headshell weighs 7.8 grams.

The auto-return function lifts and parks the arm at the end of a side. It's not fully automatic - the user still cues the record manually - but it keeps the stylus out of the run-out groove if you walk away. Akai's own German-language documentation calls it a "Halbautomat mit Direktantrieb/Quarzsynchron", which is semi-automatic with direct drive and quartz sync.

Cartridge Options and the AP-306C Variant

Here's the detail that trips people up: the AP-306 does not include a cartridge. The AP-306C does. It ships with an induced-magnet type cartridge weighing 6.4 grams, with a frequency response of 25 Hz to 30,000 Hz. The service manual explicitly notes that the base AP-306 is not equipped with a cartridge, so anyone shopping for one should confirm which variant they're looking at. The "C" suffix is not cosmetic.

Speed Adjustment and Pitch Control

The ±2.5% pitch control range is modest by DJ-deck standards but normal for a home hi-fi turntable of this class. The speed selector offers 33-1/3 and 45 rpm, and the quartz lock can be switched off when using pitch. The service manual's adjustment procedure tells technicians to release the quartz lock button to the OFF position before making speed adjustments with the internal trimpots. The strobe markings on the platter edge, lit by the neon lamp, let the user check speed visually.

Historical Context

The AP-306 was produced from 1978 to 1980, though some sources list the run as 1978-1979, and the fact sheet carries that conflict unresolved. It belongs to Akai's late-1970s turntable lineup, shares its service manual with the AP-206, and sits alongside the AP-100C and AP-206C in the same series. At least one retailer positioned the AP-306C variant as "one of the top of line Akai turntables from this range."

Original pricing is documented at 240 US dollars and 600 Deutsche Mark. That places it in the mid-tier of the Japanese direct-drive market, below the flagship quartz-locked decks but well above entry-level belt-drive models. The 1978 Atlanta IHF audio show coverage in HiFi-Stereo (October 1978, p.79) catalogued the flood of new direct-drive turntables hitting the market that year, with Pioneer alone adding four direct-drive models to its line. The AP-306 arrived in a market saturated with competing quartz-locked designs from every major Japanese manufacturer.

Collectibility & Value

The AP-306 has a modest but real following. A refurbished example was listed on Marktplaats at €899, and the deck appears on eBay under the description "Vintage Akai AP-306 Quartz Lock D.D Turntable Auto-return Made In Japan Rare 80s." Still, the most visible eBay activity is in parts: hinges, platter brackets, feet, and headshells. A listing for "2x AKAI AP 306 C Turntable Plate Bracket Lid Hinges Zipper" sold for $17.03, which says more about parts demand than about complete-unit values.

Stylus replacements are available through LP Gear, and replacement belts are listed by DaCapo Audio, though the AP-306 is direct-drive, so belts only apply to other models in the range. There is a service manual, a 32-page user manual, and repair videos on YouTube, so people are still maintaining these decks. Vinyl Engine carries three user reviews for the model. The self-lubricating motor means no routine oiling, but the PLL board and strobe circuit are the kind of electronics that can drift or fail after four decades, and they're not user-serviceable without a schematic and a frequency counter.

For buyers: confirm if you're getting an AP-306 or AP-306C, since only the C includes a cartridge. Check that the quartz lock engages and holds speed, and listen for any motor noise that would suggest bearing wear. The die-cast platter and static-balanced arm are sturdy, but the electronic speed control is where age shows first.