AEG/Telefunken Magnetophon 75

The AEG Telefunken Magnetophon 75 (also known simply as Magnetophon 75) is a portable half-track mono tape recorder from the late 1950s, produced around 1958–1962 by Telefunken under AEG's Magnetophon division in Germany. It was a direct evolution from earlier KL-series portables, offering refined tube electronics and dual speeds in both tabletop (75T) and suitcase (75K) formats for home recording and radio dubbing.

Key Technical Specifications

• Track System: Half-track mono recording/playback

• Tape Speeds: 1⅞ ips (4.75 cm/s) and 3¾ ips (9.5 cm/s)

• Maximum Reel Size: Up to 5–7 inches (13–18 cm)

• Heads: 2 heads — record/playback (permalloy composition) and erase head

• Motors: Single motor drive with mechanical transport and tension control

• Frequency Response: 60 Hz to 16 kHz (±3 dB) at 3¾ ips; 30–16 kHz on select units

• Wow and Flutter: <0.4% at 3¾ ips

• Signal-to-Noise Ratio: >40 dB unweighted (100:1 below normal level)

• Total Harmonic Distortion: <5% at playback output

• Electronics: Tube amplification (4 main valves: EF86, ECC81/ECC83, EL95, EM71A/EM84 magic eye; selenium rectifiers B250C65/110, E30C5)

• Inputs: Microphone (2–5 mV / 2 MΩ or 500 kΩ), Radio/Aux (2–5 mV to 1.5 V / 100–250 kΩ adjustable)

• Outputs: Preamp/line out, external speaker (5Ω), headphone jack

• Audio Output Power: 2.5 watts

• Equalization: IEC standard

• Features:
  Magic eye (EM71A/EM84) or fluorescent bar level indicator
  Mechanical tape counter, foil-operated auto-stop
  Tone control on later units
  Rewind: ~140 seconds for 850 ft tape

• Power Requirements: 110/127/150/220/240 V AC multi-voltage (~45 W)

• Speaker: Internal 6″ x 3″ (13x7.1 cm) oval permanent-dynamic (75K only)

• Dimensions:
  75K (suitcase): 159 x 318 x 318 mm (6¼" x 12½" x 12½")
  75T (tabletop): 140 x 235 x 311 mm (5½" x 9¼" x 12¼")

• Weight: 75K: 9.5 kg (21 lbs); 75T: 7.4 kg (16.3 lbs)

Variants and Context

• Magnetophon 75K: Full portable suitcase with speaker and carry case

• Magnetophon 75T: Tabletop amplifier version (no speaker/case)

• 75 de Luxe/15: Updated 1959 version (KL75/15) with 5¾" reels, horizontal level bar, and tone control

• Baugleich (identical construction) across AEG/Telefunken branding; priced ~469–598 DM new

The Magnetophon 75 delivered respectable mid-1950s consumer performance (5/10 sound/reliability ratings), with permalloy heads extending highs and tubes providing characteristic warmth. It improved slightly on the KL-65 with frequency response and build quality. Modern restoration typically involves capacitor refresh, idler tires, and head demagnetization. Collectible as an accessible example of AEG/Telefunken's consumer mono era, bridging early portables and later pro designs like the M-series.