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After the currents settled, the unit is fully operational and the user will be forwarded to the main
menu.

The Main Menu allows to modify the following parameters:

Compressor Gain:

The gain of the compressor without gain reduction can be adjusted in 0.5dB steps in the range of
-11db and +11 dB. To adjust the gain move the cursor with the rotary control to the gain field and
then press the rotary control.

 

The cursor will move from the left to the right and the rotary control becomes the level “pot”. The
change  is  applied  immediately,   therefore  the  engineer  can  hear  the  changes  right  away.  When

Fredenstein F660 Manual Release 2.1  July 18, 2014  Page 3

Summary of Contents for F660

Page 1: ...F660 Limiting Amplifier Operating Manual...

Page 2: ...type of compressor the relationship between anode currents and compression is almost quadratic causing the anode currents to be very small at high compression rate As with all Variable Mu is not advi...

Page 3: ...and the tubes are still powered off the unit is in bypass mode but the output meter is connected to the main output This allows the user to measure the level even in bypass mode To turn the F660 on pl...

Page 4: ...ction can be adjusted in 0 5dB steps in the range of 11db and 11 dB To adjust the gain move the cursor with the rotary control to the gain field and then press the rotary control The cursor will move...

Page 5: ...st Attack The attack time can be changed in all 6 time constants by selecting faster attack times Since the Fairchild time constants are more than simple integrating filters it is impossible to set a...

Page 6: ...u page the screen below will be displayed Meter Range The meter range of the peak meter can be switched between 60dB one LED per dB and 30dB one LED per 0 5dB In the 60dB setting the overall range is...

Page 7: ...as previously used it is indicated but you can overwrite it Recall Configuration You can recall the store configurations Only previously stored configurations will be displayed and allowed to recall F...

Page 8: ...vel at the main input and adjust the threshold control until the output Level is 10dB Then modify the Reduction Calibration until the gain reduction meter reads 10 dB Main Menu Push main menu to get b...

Page 9: ...Contact Info Fredenstein Professional Audio by Orion Communication 7F 1 No 582 Ruei Guang Rd Neihu District Taipei 114 Taiwan Phone 886 2 2657 2618 Email info fredenstein com Web www fredenstein com...

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