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The HERCHILD Model 660 is our newest release and one of the products we are proudest of. A tube-based audio 
compressor with a striking resemblance to one of the most famous compressors of all time, the Fairchild 660.After years of 
research, development and new designs we are finally ready to release this beast to the public. While making sure to 
capture all the lush sound and mystique of the original we were able to improve on several aspects and offer a more 
reliable, more durable, modern version that will last you for decades to come.

The HERCHILD Model 660 contains nothing less that 11 valves and 5 transformers to achieve that indistinguishable, 
classic, triumphant sound that we all know and love. The original intention of the his historical compressor was to be used 
in the cutting of lacquer masters for vinyl albums, but it soon became an industry standard for getting that all enveloping 
sound that takes us to another level.
The Fairchild 660 is found on almost all of the classic releases in the 60´s and 70´s, defining the sound of a generation…or 
two.

The grandaddy of all tube-based compressors had a relatively limited amount produced, somewhere between 500 and 
1,000 units.Therefore, some 60 years later there are only a small amount that remain today. There are even fewer that are 
totally usable as years have gone by since it´s late 1950´s introduction so many units aren´t exactly as they once 
were.Maintenance is obligatory on a high-end piece like this and unfortunately, too many of them have simply been 
neglected and aren´t up to their optimal specifications. This means an alternative is needed.And this is where the 
HERCHILD Model 660 comes in, to once again offer that magic that only this compressor design can.

Our HERCHILD Model 660 offers a couple of new and ever so helpful features. The user now has immediate access to the 
all important DC THRESHOLD.This control basically combines adjustments to the progressively developing curved RATIO 
and the KNEE simultaneously through 4 different settings varying from a gentle slope to a more pronounced and 

aggressive slope.This control really does put

 

sound manipulation right at your finger tips as opposed to the original´s out of 

reach and inconvenient screw adjuster. The other main addition is something no modern day studio can be without, a side 
chain filter.With the SC FILTER on the HERCHILD Model 660 you have 4 different frequencies to choose from: 50, 100, 
200 and 350Hz.Using this feature you now have lots more control over just how much compression will be applied as you 
can make it less sensitive to the lower frequencies therefore allowing more compression where you need it and for the track 
to stay powerful.

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Summary of Contents for Herchild 660

Page 1: ...USER MANUAL April 2022 Rev 1 0 SINGLE CHANNEL TUBE COMPRESSOR AMERICAN HERITAGE MODEL 660...

Page 2: ...s asked for this equipment which makes them virtually unobtainable for the great majority Now it s possible to obtain that same sound with a brand new piece that will give you all the problem free hea...

Page 3: ...unt that remain today There are even fewer that are totally usable as years have gone by since it s late 1950 s introduction so many units aren t exactly as they once were Maintenance is obligatory on...

Page 4: ...SHOLD The threshold knob determines when the compression begins It s used to decide when and how much gain reduction takes place When in the fully counter clockwise position the HERCHILD Model 660 wil...

Page 5: ...onnector 3 VALVES 11 User changeable valves with easy access 4 POWER INPUT IEC standard power input connector 5 VOLTAGE SELECTOR Here you can select the correct voltage input according to the country...

Page 6: ...conds for individual peaks 10 Seconds for multiple peaks 5 Seconds 2 Seconds 8 Seconds 3 Seconds ATTACK 1 2 3 4 5 6 TIME CONSTANT SETTINGS MEDIUM KNEE PROGRESSIVE LOWER RATIO HARD KNEE HIGH RATIO LIMI...

Page 7: ...LICATIONS BASS RECORDING 7 MONITOR SPEAKERS THUNDERBOLT COMPUTER OUTPUT AUDIO INTERFACE LINE INPUT AUDIO INTERFACE MONITOR SPEAKERS THUNDERBOLT COMPUTER LINE INPUT AUDIO INTERFACE D I INPUT PREAMP TT...

Page 8: ...ency Response 40Hz to 15kHz 1db Self Noise Less than 82dBu Harmonic Distortion Less than 1 at any level up to 18dBu output no limiting Dimensions W x H x L 482mm x 134mm 3 Rack units x 200mm Weight 7...

Page 9: ...allowed the recommend 30 minutes for the unit to warm up The readings on the VU meter don t seem to correspond with what is actually happening Sounds like it s time for some calibrating The compressio...

Page 10: ...ase date The warranty excludes problems due to normal wear abuse shipping damage or failure to use the product in accordance with the specifications Heritage Audio shall not be liable for damages base...

Page 11: ...RECALL SHEETS 11 Session Title Track Connected Equipment Date Instrument Notes Session Title Track Connected Equipment Date Instrument Notes...

Page 12: ...www heritageaudio com HERITAGE AUDIO C Alfonso G mez 38 3C 28037 Madrid Spain Tel 34 917 266 189 info heritageaudio com...

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