Technics RS-BX501

A two-motor auto-reverse cassette deck with ATC calibration and Dolby HX Pro, made for precision tape recording and playback.

Overview

Technics built this deck around Automatic Tape Calibration (ATC). It adjusts bias, equalization, and recording levels in 64 steps, using test signals at 400 Hz, 5 kHz, and 10 kHz. It handles Normal, CrO2, and Metal tapes and detects the tape type automatically. A wireless remote comes with it. Wow and flutter are low, and frequency response is wide across all three tape types.

Specifications

Type	Cassette deck
Heads	Recording / Playback : Permalloy, Erasing : double-gap ferrite
Wow flutter	± 0.14% (W peak, JEITA), 0.07%(W.R.M.S)
Frequency Response (JEITA)	Normal : 30 Hz to 15 kHz ± 3 dB, CrO2 : 30 Hz to 15 kHz ± 3 dB, Metal : 30 Hz ~ 16 kHz ± 3 dB
Frequency Response (Other Standard)	30Hz-16,000Hz (±3dB)
Signal-to-noise ratio	NR off : 56 dB (Chrome Tape, WTD, 1 kHz, 3% 3rd order distortion factor), Dolby B NRon : 66 dB (Chrome Tape, WTD, 1 kHz, 3% 3rd order distortion), Dolby C NRon : 74 dB (Chrome Tape, WTD, 1 kHz, 3% third order distortion)
Power	100 VAC, 50Hz/60Hz
Power consumption	14W
External dimensions	Width 430x Height 125x Depth 293 mm
Weight	3.8kg
Attachment	Wireless Remote Control

Design

The RS-BX501 has ATC (auto-tape calibration), Dolby HX-PRO, and Dolby B/C noise reduction. The erase head is a double-gap ferrite type, and the record/play heads are Permalloy. High-speed FF/REW cuts winding time by about half compared to conventional decks. The power-assist cassette holder keeps tape travel stable. Other features are auto REC mute, memory stop, TPS (Tape Program Sensor) to find where recordings start, a timer counter, and an MPX filter switch. Left/right balance, recording level, and headphone output are all adjustable.

Context

The RS-BX501 shares a product family with the RS-BX601. The 601 has a monitor function during recording that the 501 lacks, which suggests it is the higher-end model. Both are late-era Technics cassette decks that lean on automation and calibration accuracy.

Market

The RS-BX501 was priced at ¥34,800 in 1994 and later listed at £275.99. In recent years working units have turned up on secondhand markets for around £65. Known problems include failed capacitors, such as C616 causing power shorts, and mechanical failures in the gears or sensing switches. A service manual is available. Some repair experiences suggest long-term reliability may be limited by aging components.

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