Ampro 758

The Ampro 758 is a late-1950s/early-1960s Ampro machine that represents the company’s final, more “hi-fi-leaning” generation of mono tape recorders before stereo and transistorized designs took over.

Type: Portable reel-to-reel tape recorder

• Electronics: Vacuum tube (valve-based)

• Positioning: Upper-end consumer / semi-professional mono recorder

This model builds directly on the 757, with incremental improvements in stability, audio response, and usability.

Tape transport and format

• Tape width: ¼-inch

• Track format: Half-track mono (two recording sides)

• Heads: 2-head configuration (erase + combined record/playback)

• Maximum reel size: 7-inch

The transport is mechanically similar to the 757 but generally refined for smoother tape handling and slightly lower flutter.

Tape speeds

• 3¾ ips (9.5 cm/s) — long-duration recording

• 7½ ips (19 cm/s) — higher fidelity

The inclusion of 7½ ips places it firmly in the “hi-fi capable” category for its time.

Audio performance

Typical figures for the Ampro 758 class:

• Frequency response:3¾ ips: ~50–8,000 Hz
  7½ ips: ~50–13,000 Hz
  

• Signal-to-noise ratio: ~45–50 dB

• Wow & flutter: ~0.3–0.4%

Compared to earlier Ampro machines:

• Better high-frequency extension

• Slightly improved noise performance

• More stable pitch due to refined transport

Amplifier and electronics

• All-tube amplifier design (multi-stage, including preamp and power output tubes)

• Output power: roughly 6–10 watts

• Integrated speaker system: internal full-range speaker, often with provision for external speaker

• Tone controls: basic equalization (bass/treble)

Like other Ampro units, the 758 is self-contained, requiring no external amplifier for playback.

Controls and features

Transport system

• Push-button control (mechanical with electrical assistance)

• Standard functions: play, record, stop, rewind, fast forward

• Interlock mechanism to protect tape and heads

Recording features

• Magic eye tube level indicator

• Manual recording level control

• Record safety lockout

Monitoring

• No true off-tape monitoring (2-head design limitation)

• Monitoring through amplifier path

Connectivity

• Microphone input

• Line/radio/phono input

• External speaker output

• Auxiliary output for connection to other audio systems

This allows use in:

• Home recording

• Radio program capture

• Basic music recording

Mechanical design

• Capstan + flywheel drive system for speed stability

• Idler/belt-driven reel system

• Heavy portable cabinet (suitcase or tabletop form factor)

• Weight typically around 16–18 kg

Build quality is robust, consistent with Ampro’s reputation for durable equipment.

Technical significance

The Ampro 758 represents:

• One of the last refined mono tube tape recorders from Ampro

• A near-peak of their consumer tape technology

• A design that approaches hi-fi performance but stops short of:Stereo recording
  3-head monitoring
  Transistor electronics
  

It sits just before the industry-wide shift to stereo reel-to-reel decks in the 1960s.

Strengths

• Improved frequency response (especially at 7½ ips)

• Stable transport with reduced wow/flutter

• Solid, reliable tube electronics

• Fully self-contained system

• Good versatility for home audio use

Limitations

• Mono only

• 2-head design limits recording precision and monitoring

• Still moderate noise compared to later hi-fi decks

• Bulky and heavy

Bottom line

The Ampro 758 is essentially a refined evolution of the 757, offering:

• Slightly better fidelity

• Improved mechanical stability

• Mature late-1950s design

It represents the end of the line for Ampro’s mono reel-to-reel recorders, just before stereo, multi-head, and solid-state machines redefined tape recording in the 1960s.