DIN Connectors - Their history and uses in audio

"DIN connector" identifies types of cylindrical connectors that the German Institute for Standards (DIN) standardised for analog audio signals initially in the mid 1950s.

DIN connectors, particularly the 5-pin version, were historically used in various audio applications, including amplifiers. Here are some types of audio amplifiers that may have DIN connectors:

1. **Vintage Hi-Fi Amplifiers**: Many older hi-fi amplifiers from brands like **B&O**, **Philips**, **Sony**, Grundig, B&O and **Technics** used DIN connectors for speaker outputs or inputs.

2. **Integrated Amplifiers**: Some integrated amplifiers from the 1970s and 1980s featured DIN connectors for connecting to sources like turntables or tape decks.

3. **Home Audio Systems**: Certain home audio systems, especially those designed for compatibility with older equipment, may include DIN connectors.

4. **Professional Audio Equipment**: Some professional audio gear, especially older models, might feature DIN connectors, particularly for connecting to microphones or other audio sources.

5. **DIY or Custom Amplifiers**: Some DIY audio amplifiers may use DIN connectors, especially if they are designed to work with older audio equipment.