TEAC A-7300 RX

The TEAC A-7300RX is a semi-professional, two-track stereo reel-to-reel tape deck introduced around 1976, notable for its high fidelity, robust build, and incorporation of the then-new dBx noise reduction system. It is a two-unit system with a separate transport and amplifier section, designed for mastering and high-quality recording applications.

Track System and Heads

• 2-track, 2-channel stereo/monaural system

• Three heads: one record, one playback, one erase, all made of high-density Permaflux material arranged in a stacked/inline configuration for precise tape handling.

Motors and Tape Transport

• Three motors: one direct drive DC servo capstan motor for stable tape speed control and two eddy current induction reel motors for accurate tape tensioning.

• Tape speeds: 7½ and 15 inches per second (ips).

• Supports reels up to 10.5 inches in diameter.

Noise Reduction and Sound Quality

• First deck to incorporate dBx deci-linear noise reduction, dramatically improving signal-to-noise ratio to about 100 dB with dBx engaged, compared to 65 dB without it.

• Signal-to-noise ratio: 60 dB without dBx, 100 dB with dBx.

• Total harmonic distortion: 0.4% with dBx, 0.8% without at 1 kHz normal operating level.

• Crosstalk: approximately 35 dB to 50 dB depending on measurement conditions.

• Frequency response: 30 Hz to 28 kHz at 15 ips, 30 Hz to 24 kHz at 7½ ips (±3 dB).

• Wow and flutter: very low, 0.04% at 15 ips and 0.06% at 7½ ips, ensuring stable pitch.

Inputs and Outputs

• Four line inputs (100 mV, 50 kΩ impedance) and four microphone inputs (0.25 mV, 600 Ω impedance).

• Outputs include two line outputs (0.3 V, 10 kΩ load impedance) and a stereo headphone jack (8 Ω).

• Connectors include both XLR and RCA types for professional and consumer compatibility.

Additional Features

• Built-in 4-in, 2-out mixer with master level control and 20 dB mic attenuators for flexible live recording without external mixers.

• Three-position bias and EQ switches for precise tape type matching.

• IC logic controls with optional remote control capability up to 16 feet away.

• Edit button to disable take-up reel motor for tape editing.

• Elapsed time counter with memory for accurate tape position tracking.

• Dual-scale VU meters (+3 or +6 VU) for accurate level monitoring.

• ±5% pitch control to adjust playback speed finely.

Physical Characteristics

• Dimensions: Transport unit approximately 470 x 455 x 300 mm; amplifier unit approximately 470 x 205 x 310 mm; combined about 940 x 410 x 620 mm (37 x 16 x 24.5 inches).

• Weight: Transport 28 kg (61.6 lbs), amplifier 13 kg (28.6 lbs), total about 41 kg (90.2 lbs).

Reliability and User Notes

• The A-7300RX is regarded as a "tank," built very solidly with high-quality components.

• It is similar internally to the TEAC A-7300 and Tascam 25-2 models but includes the dBx noise reduction and some additional power supply circuitry.

• Some users report challenges sourcing parts and servicing due to PCB corrosion issues typical of early TEAC models, requiring careful maintenance and occasional component replacement.

• The separate transport and amplifier units aid in handling the deck's considerable weight and complexity