Aiwa TP-704
Aiwa
Japan
Tape Deck Details
Number of Motors
1
Number of Heads
2
Head Configuration
Dual-track-mono
Wow & Flutter
Signal-to-Noise [dB]
Dimensions [mm]
Weight [kg]
Year built
1965 - 1968
Head Composition
Permalloy
Equalization
NAB
Frequency Response
Speed
1⅞, 3¾
Max Reel [inch]
7
Tracks
1/2 Rec/PB
Price
User
Consumer
Additional Information
The Aiwa TP-704 is a compact 1965–1968 portable open-reel tape recorder from Aiwa's early solid-state lineup, designed for consumer dictation, lectures, and basic music dubbing with mains/battery flexibility.
Positioning and Era
Mid-1960s "lunchbox" mono portable emphasizing affordability and speed selection via electrical switch (unlike cheaper capstan-sleeve models), bridging Aiwa's pocket recorders and larger suitcase decks.
Transport and Tape Format
Reel size: 5-inch maximum (7-inch possible with care).
Drive system: Capstan drive with pinch roller; fast-forward capable.
Speeds: 1⅞ ips and 3¾ ips (electrical switch).
Track format: 2-track, single-channel monaural (half-track mono).
Heads: 2 permalloy heads (erase + record/playback).
Electronics and Performance
Circuitry: Fully transistorized; piano-key controls, tone control, VU meter (doubles as battery indicator).
Power: 4 × C-size 1.5V batteries (6V DC) or 110–120V AC.
Output power: 500–800 mW to internal speaker.
Speaker: 2¾ × 4¼-inch (69 × 108 mm) oval dynamic driver.
Equalization: NAB; sound quality rated 4/10, reliability 6/10 by users.
Controls, I/O, and Features
Transport: Rewind, Stop, Fast Forward, Play; separate red Record button (with Play).
Inputs/Outputs: Mic, remote start, DC supply (mini-jacks); earphone, aux line out.
Construction and Dimensions
Size: 340 × 311 × 65 mm (13½ × 12¼ × 2½ inches); lightweight plastic/metal case with handle.
Use and Restoration Notes
Versatile for vintage voice tapes; excels post-service at 3¾ ips. Common fixes: pinch roller/capstan rubber, belts/idlers, electrolytic recap, switch cleaning. A step up in convenience for Aiwa portables of the era.