Old 08-05-2019, 06:21 AM   #1
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Posts: 342
Default vintage 670 compressor

Can someone enlighten me as to which control sets the attack time on this compressor. The controls are not labeled with the standard control names. Thanks.
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Old 08-05-2019, 07:13 AM   #2
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Did you mean Fairchild Model 670 Stereo Limiter?

Because it is not your standard compressor.

Originally Posted by manual p.4
Attack time
  • .2 ms position 1, 2, 6
  • .4 ms position 3, 4, 5

Release time
  1. Position
  2. .3 s
  3. .8 s
  4. 2 s
  5. 5 s
  6. automatic function of program material 2 s individual peaks, 10 s multiple peaks
  7. automatic function of program material .3 s individual peaks, 10 s multiple peaks, 25 s for high consistently program level
Also from the manual

Originally Posted by manual p.10
The TIME CONSTANT switches give a wide choice of constants. Position 3 is merely general suggestion for a general result timing circuit. With certain popular music or speech a much faster time constant, such as positions 1 or 2, much be more desirable. For classical music a much slower position, such as 4, is useable. Positions 5 and 6 combine fast release with slow release and can be useful if a great amount of automatic level correction is required. These positions also make the limiter action less audible since they will reduce overall program level if continual limiting persists.
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