Teac A-3340 (1972–1976)

A three-motor quarter-inch deck that put four-track Simul-Sync recording within reach of the home studio. It carried a $850 price tag when that was real money.

Overview

The A-3340 is a semi-professional quarter-inch open-reel deck built by Teac in Japan. The version most collectors run into records four tracks with Simul-Sync. That feature lets you lay down a part, monitor it off the tape while you overdub the next one, and build an arrangement one pass at a time. Teac's own service documentation describes the machine as capable of Simul-Sync, quadriphonic, stereophonic and monophonic recording and playback, running at 7-1/2 and 15 ips and accepting reels up to 10-1/2 inches in diameter. Four tracks, two speeds, big reels, sync monitoring. It is not a hi-fi ornament. It is a small studio in a box.

The transport is a three-motor design, and Teac used that layout across the whole family. The service manual groups the A-3340 with the A-3300 and the -10/-11/-12 variants as machines sharing "a highly reliable three motor drive system." In the A-3340 that means one dual-speed hysteresis synchronous motor driving the capstan and two eddy-current induction motors handling the reels. Supply and take-up get separate motors, which gives stable tape tension instead of the drifting, uneven pull of a single-motor transport. Owners who have lived with these decks for years tend to describe the transport, not the electronics, as the part that keeps them coming back.

Speeds are the classic pair: 7-1/2 and 15 ips. Fifteen is where the deck earns its keep. Euromaxx lists a frequency range of 25 Hz to 24 kHz at that speed. The Museum of Magnetic Sound Recording lists timing accuracy for the A-3340 at .08%, which keeps pitch stable across a long side and keeps layered overdubs from drifting against each other. Signal-to-noise is rated at 55 dB, and total harmonic distortion at 1%. Those numbers are honest for the period rather than spectacular. This is a working machine, not a mastering lathe.

Channel separation is listed at approximately 50 dB at 1 kHz. That matters on a four-track deck, because when you bounce tracks or monitor one channel while recording another, bleed between channels compounds with every pass. Fifty dB is enough to keep a four-track production from turning to mush after a few overdubs. Line input is rated at 100 mV and microphone input at 0.25 mV, with line output at 0.775 V. Those are consumer/prosumer interface levels of the era, so the deck plays nicely with the outboard gear of its day and doesn't demand a studio patch bay.

The whole package weighs in at 50 lbs. Fifty pounds of transformer, motor, and steel is why these decks survive, and also why shipping one is a project in itself.

Key Features

Four-Track Simul-Sync Recording

Simul-Sync is the A-3340's reason for existing. The deck records four tracks on quarter-inch tape and lets the record head double as a playback head in sync mode, so a performer can hear previously recorded tracks off the tape while adding a new one in time with them. Teac's own literature for the sibling A-3340S, the same basic machine with pushbutton transport, marketed it as a partner in the creative process, "a professional recording studio engineered into a 50 lb. package." That is advertising copy, not a review verdict, but it accurately describes what the feature set was for.

Three-Motor Transport

One dual-speed hysteresis synchronous capstan motor, two eddy-current induction reel motors. The capstan motor sets tape speed. The reel motors handle tension and fast winding independently. The payoff is consistent tape-to-head contact and fewer of the speed wobbles that plague cheaper single-motor decks. The service documentation notes that the transport mechanisms of the A-3340 and A-3300 are identical apart from operating speeds and head configuration, so the mechanical design is shared with a well-established family.

7-1/2 and 15 ips Operation

Two speeds, two jobs. Fifteen ips for critical recording and overdubbing, where the 25 Hz–24 kHz range and tighter timing accuracy live. Seven-and-a-half for longer running time and casual playback. The A-3340 accepts reels up to 10-1/2 inches in diameter, which is the large NAB size — meaning a full 2,400-foot reel at 7-1/2 ips gives you serious uninterrupted running time.

Four-Channel Capability

The machine is designed for stereo, monophonic, and quadraphonic recording and playback. In practice, most owners used it as a four-track multitrack rather than a quad playback deck, but the quadraphonic capability was part of the pitch in an era when four-channel was being pushed hard at consumers. A Russian-language account of the machine draws the contrast directly: unlike the Revox, which was oriented toward stereo recording, the Teac A-3340 offered multi-channel recording capabilities.

Historical Context

Production is generally placed between 1972 and 1976, with one source giving the narrower "approximately from 1972" and the Museum of Magnetic Sound Recording listing a 1976 reference. The original price was $850. That is a single-source figure, but it is consistent with what a four-track semi-pro deck cost in the early-to-mid 1970s. Teac's period advertising for the closely related A-3340S ran in the consumer audio press through 1977, including a July 1977 placement in Audio (July 1977, p.122) that framed the deck as an affordable tool for overdub sessions, demos, and experimentation. Studio Sound ran similar A-3340S advertising copy in early 1978, describing the deck as a partner in the creative process. Again, that is manufacturer marketing rather than independent measurement.

The A-3340's place in the family is documented rather than inferred. Teac's own service literature groups it with the A-3300 and the -10/-11/-12 variants under a shared three-motor drive system, and a combined A-3300/A-3340 service manual exists. The A-3440, a later four-channel multi-track deck, is documented as building on the A-3340S design. One documented owner: a Russian-language account of Vladimir Vysotsky's tape recorders identifies the TEAC A-3340 as one of the two machines he used.

Collectibility & Value

The A-3340 has a genuine collector following, helped by the fact that it is not as common as some other vintage decks. The original $850 price is documented. Current market values are not well established in the available record, so treat asking prices with caution rather than assuming a fixed range. The related A-3340S shows up regularly on eBay and is tracked by HifiShark. Refurbishment specialists, including one shop in Montana that documents its deck refurb work on video, exist specifically to bring these machines back. Restoration videos for the A-3340 itself are out there, including full-overhaul and post-restore test documentation.

On maintenance, the failure modes are the ones you would expect from a machine of this age and construction. Rubber components, meaning pinch rollers and any belts in the transport, harden and crack. Tape heads accumulate oxide and need cleaning and demagnetizing. Head alignment drifts and takes frequency response and stereo imaging with it, so a professional alignment against a calibration tape is the first money you spend on any example. Electrolytic capacitors in the power supply and audio circuits dry out over time, and a recap is often the difference between a working deck and a noisy one. Replacement parts come through specialty restoration suppliers, and service manuals are available. Budget for service on any unrestored example, and expect the 50-pound shipping weight to add real cost to any purchase that crosses a border.