Category:B&O 608 amplifier

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The B&O 608 was a hybrid (tube + transistor) mono integrated amp produced in 1962. Curiously enough, instead of using twin EL84s (the industry standard valves), B&O used a quad of ECL85 triode-pentodes.

The big display in the middle rendered 'frequency response' with a spring, which was bent up or down with bass/treble controls.