![]() ![]() This was considered to be lightning fast at the time, and the figures weren’t beaten until a decade later, when solid-state units with FET gain cells (like the Universal Audio 1176LN) brought attack values down to a mere 20 microseconds. All positions offer extremely fast attack values, between 0.2 and 0.8 milliseconds. There’s also a single switch offering six time-constant ‘presets’ - in other words, each switch position selects a different pairing of attack and release times (see box). Switches select L-R or M-S operation on the Fairchild 670, and the VU meter mode, which can display gain reduction or plate current, for calibration purposes. A rotary switch increases the input signal in 1dB steps, and there’s a rotary threshold control. Setting aside the parallel wiring of multiple valve stages, the otherwise basic layout of the circuitry is typical for the era in which the Fairchild was born, and the same can be said for the simple set of controls. ![]()
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