Teac A-3340S

Forty-nine and a half pounds of semi-professional tape deck that turned a bedroom into a four-channel studio. You brought your own amplifiers.

Overview

The A-3340S is a quarter-inch, four-track open-reel deck that runs at 15 and 7-1/2 ips. The first thing a new owner notices is the weight: 49.5 lbs net, most of it transport. Two 6-pole eddy-current motors handle the reels. A separate 4/8-pole hysteresis synchronous capstan motor pulls tape past a three-head stack - one erase, one record, one playback. Wow and flutter is 0.15% at 15 ips and 0.18% at 7-1/2 ips, measured RMS to the unweighted NAB standard on TEAC's own YTT-2003/2004 flutter-free tape during playback. Those are honest semi-pro figures, and they're why the deck earned its reputation among people cutting demos rather than just archiving LPs.

TEAC's own literature from the period leaned hard on the creative angle. Studio-Sound (September 1975, p.51) described the A-3340S as "a professional recording studio engineered into a 50 lb package at a fraction of its cost." The pitch centered on Simul-Sync - you record instruments and voices together or one at a time, and the sync head lets you monitor previously laid tracks as each new one goes down. That's the whole reason this machine exists. It isn't a hi-fi playback deck with recording bolted on. It's a four-channel overdubbing tool that happens to sound good.

Here's the catch. The A-3340S is a discrete four-channel deck, so using all four channels takes either two separate two-channel amplifiers or one four-channel amp with discrete inputs and outputs per channel. TEAC's manual is blunt about it: if your amplifier doesn't have four separate jacks matching the LINE IN jacks on the deck, discrete four-channel recording and playback "cannot be expected." Channels are numbered to match tape tracks and labeled FRONT and REAR. Channel 1 is front L1, channel 2 is rear L2, channel 3 is front R3, and channel 4 is rear L4, so the deck fits a quad setup or a two-amp stereo arrangement without guesswork. Buyers who assumed they could just plug it into their receiver's tape loop found out otherwise.

It's a flexible machine physically. It sits horizontally or vertically, takes 10-1/2" NAB reels maximum, and winds a 1,800-foot reel in roughly 140 seconds or less. The head complement and the two-speed transport are the core of the package. The rest is TEAC's usual attention to the boring stuff that keeps tape moving straight.

What the "S" Actually Changed

The A-3340S is a revision of the A-3340, and TEAC's own comparison chart spells out what moved. The transport controls went from a lever switch with buttons to all pushbuttons, including a dedicated PAUSE. Remote and timer adaptation arrived, with the RC-120 remote and RC-320 timer adapter listed as supported. The single tape selector became separate BIAS and EQ switches. A single PHONES jack with a front/rear/mix switch became two separate jacks, front and rear. Output level jumped from 0.3V (-8 dB) to 0.775V (0 dB). The tape speed switch changed from a rotating selector to a pushbutton, and the power switch moved from the amplifier section to the transport section. TEAC notes other minor parts and circuit changes beyond the chart.

The output level change is a big one. Raising the nominal output from 0.3V to 0.775V means the deck works with a wider range of downstream gear, which helps anyone patching into a console or a preamp that wanted a hotter signal. The separate BIAS and EQ switches are the other quiet upgrade. Instead of one tape selector, you set bias and equalization independently, which is handy when you're swapping between tape formulations.

The A-3340S was also the foundation for what came next. TEAC's manual for the A-3440 describes that deck as a development of the well-known A-3340S, sharing a virtually identical transport section while the controls and electronics were extensively redesigned. The FUNCTION SELECT and OUTPUT SELECT switches on the A-3440 give instant selection of source, sync, and normal off-tape monitoring, and a rear-panel interface accepts the RX-9 DBX noise reduction unit.

Living With It

TEAC's service documentation opens with a statistic: roughly 40% of service calls immediately after purchase traced back to improper operation, not failed parts. The manual's answer was to tell owners to read it thoroughly and keep the deck clean, because neglect degrades performance and regular preventive maintenance buys a long, trouble-free life.

The A-3340S is documented better than most vintage gear. There's a troubleshooting guide listing specific malfunctions with possible causes, mechanical and electrical adjustment procedures, head alignment and replacement sections, disassembly instructions, and a full parts list published separately. Line voltage and frequency conversion is covered too, along with a table of line voltages and cycles around the world. That's useful, since the deck shipped in at least two power variants. The DM version runs 100V at 50 or 60 Hz. The TCA version is 117V/60 Hz for TEAC Corporation of America. Anyone importing a unit needs to know which one they're buying.

Market and Collectibility

The A-3340S sits in a specific niche in the used market: not a museum piece, not a bargain-bin curiosity, but a working tool that people still buy to use. It's a four-channel Simul-Sync deck with two speeds and a documented service history, which keeps it in demand among home recordists, analog archivists, and anyone who wants multi-track capability without paying studio money. TEAC itself leaned on price in the period advertising. Audio (July 1977, p.122) ran copy aimed at "everyone who's ever dreamed of owning an A-3340S," noting the deck had been priced lower than before and calling it the most popular multi-track machine as an imaginative tool for overdub sessions, demos, and experimentation.

Condition drives everything. A clean, serviced unit with good heads and fresh rubber is a different purchase than a barn-find transport with a seized capstan. Buyers should confirm which power variant they're getting, check that all four channels pass signal, and budget for at minimum a cleaning and calibration. The deck's near-50-pound shipping weight is its own problem. These don't travel cheaply, and TEAC's manual warns that improperly packed returns are the shipper's problem.

Market Value

┌──────────────────────────────────────────────────────────────────────────┐
│ TEAC A-3340S                                                    Nov 2026 │
├──────────────────────────────────────────────────────────────────────────┤
│ High      $1,534                                  Latest            $925 │
│ Median    $627                                    Trend                — │
│ Low       $173                                    Volume           ~4/mo │
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│ $2,000 ┤                                                                 │
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│ $1,186 ┤                                      .                          │
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│        │                .                     .          .  .    .       │
│        │.  .     .            .    .              .  .  .             .  │
│   $100 ┤        .  .                 .                                   │
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│    vol │▄  ▄ ▄  ▄▄ ▄    ▄ ▄   ▄    █ ▄        █   █  ▄  ▄▄  ▄    █    █ ▄│
│        └─────────────────────────────────────────────────────────────────│
│         2026-01                      2026-05                      2026-08│
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