British Ixos speaker selector. You can switch between 4 pairs of speakers. It is a circuit configuration that prevents a decrease in impedance by combining parallel and series. There are line wounds and dullness (Oikawa Tetsuji)
Maintenance information: 2024.8.15 continuity confirmed
Accessories: none
Main specifications: W179 x H68 x D133 mm approx. 0.8 kg