AEG/Telefunken Magnetophon M5

The AEG Telefunken Magnetophon M5 series represents early professional studio-grade open-reel tape recorders from the late 1950s to early 1960s, produced by Telefunken under AEG's Magnetophon division in Germany. The lineup includes mono (M5, M5A) and stereo (M5B) variants designed for broadcast and recording studios, featuring robust construction and high tape speeds for superior fidelity.

Key Technical Specifications (M5/M5A Mono base model)

• Track System: Full-track mono (1/4" tape); stereo variants (M5B) use quarter-track 2-channel

• Tape Speeds: 7½ ips (19 cm/s), 15 ips (38 cm/s), and 30 ips (76 cm/s) on select professional configurations

• Maximum Reel Size: Up to 12 inches (30 cm) NAB hubs or freestanding pancakes

• Heads: 3-head configuration (erase, record, playback) with permalloy laminations and built-in tape cutter/shear; based on AEG K9/T9 headblock design

• Motors: Dual motors — hysteresis synchronous capstan motor and special eddy-current reel motor for precise tension/speed stability

• Frequency Response: 40 Hz–15 kHz (±2 dB) at 15/30 ips; excellent low-end extension for era

• Wow and Flutter: <0.15% at 15 ips

• Signal-to-Noise Ratio: >55 dB (weighted)

• Total Harmonic Distortion: <3% at 0 VU

• Electronics: Tube amplification (6 tubes primary: ECC81/ECC83 preamps, EF86, EL84 outputs); balanced XLR inputs/outputs (5 kΩ in, 40 Ω out)

• Inputs/Outputs: Professional balanced line-level; symmetrical circuitry for studio integration

• Equalization: German standard (Deutsche Schichtlage); NAB/IEC adaptable

• Features: Variable rewind speed, tape shear/cutter integrated in headblock, wooden transport case, optional pilot tone for sync

• Power Requirements: 110/127/220/237 V AC multi-voltage

• Dimensions: 560 x 307 x 504 mm (22" x 12.1" x 19.8") typical

• Weight: 46–52 kg (101–114 lbs) depending on configuration

• Build: Heavy-duty studio transport in wooden crate/case; modular chassis available separately

Variants and Context

• M5/M5 Studio: Base professional mono model (1955–1961)

• M5A Mono: Updated 1961–1970 with refined electronics, 9/19/38 cm/s speeds

• M5B Stereo: Quarter-track stereo version with dual amp chassis

• M5C: Late transistor-hybrid successor (limited production)

Priced as semi-professional studio gear (~DM 2,500+ new), the M5 series competed with Studer and Lyrec, earning praise for mechanical precision and tape handling. Tube warmth and high speeds delivered reference mono performance for classical/broadcast work. Today, restored examples are rare collectibles; maintenance focuses on motor bearings, head alignment, and recap. Successor to early KL portables, predecessor to M10/M15 pro line—hallmarks of AEG/Telefunken's golden engineering era.