Technics RS-1506

The Technics RS-1506 is a high-fidelity reel-to-reel tape deck from the late 1970s, built on the acclaimed RS-1500 platform but optimized for quarter-track recording on both sides with half-track playback capability.

Key Specifications

It features a 4-track, 2-channel stereo/monaural system with speeds of 3¾, 7½, and 15 ips, supporting up to 10.5-inch reels under NAB equalization. Wow and flutter measures 0.018% at 15 ips, frequency response reaches 30Hz–30kHz at 15 ips, signal-to-noise ratio is 57dB, and total harmonic distortion is 0.8%; inputs are 60mV (line)/0.25mV (mic), output 0.775V (line).​

Recording & Calibration Features

Designed for serious recording and alignment work:

• Front-panel bias adjustment

• Record level calibration controls

• Playback EQ selection
  NAB / IEC (region-dependent)

• Built-in test oscillator
  Typically 1 kHz and 10 kHz

• Source / tape monitoring

Inputs & Outputs

• Unbalanced RCA line inputs and outputs

• Microphone inputs (on many versions)

• Remote control capability (optional accessory)

• Some export or broadcast units may include:
  Balanced outputs
  External control interfaces

Design Features

The deck uses three motors (two for reels, one quartz-locked direct-drive for the 34mm capstan with dual pinch rollers), an Isolated Loop tape path for low modulation noise, electronic tension control, and Sendust heads with a switchable playback head. Additional elements include pitch control (±6%), logic braking, source/tape monitoring, and low tape tension around 80g; dimensions are 446 x 456 x 258mm, weighing 25kg.​

Historical Context

Produced from 1978 to 1987 in Japan, the RS-1506 targeted audiophiles seeking extended recording time and stability, earning praise for reliability and sound quality among vintage enthusiasts despite its lower tape tension suiting fresher media best.

Reputation & Legacy

• Shares the legendary reliability and speed stability of the RS-1500

• Often preferred by:
  Home recordists
  Archival playback users
  Audiophiles with mixed tape collections

• Highly respected as one of the best ¼-track machines ever built

Collectability & Current Status

• Highly collectible, though usually slightly less expensive than RS-1500

• Value depends heavily on:
  Head wear (¼-track heads wear faster)
  Quartz lock performance
  Overall mechanical condition

• Popular platform for:
  Professional restorations
  Modern electronics upgrades