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The SSL Clone

Categories
AudioDIY:Pro Audio
Features
Schematics | PCB layout
PSU
 

This compressor is cloned from the SSL4044E desk from 1985 and is one of Gyraf Audio's excellent pro audio DIY projects.

Specifications

Ratio 2:1, 4:1, 10:1
Attack 0.1, 0.3, 1, 3, 10, 30 mSec
Release 0.1 sek, 0.3 sek, 0.6 sek, 1.2 sek, 2.4(Auto)
Make-up gain 0 to 20dB adjustable
Threshold -20 to +20dBm
Input 50K Ohm electronically balanced
Output 100 Ohm electronically balanced
Freq. Resp Less than 15Hz to more than 35kHz within 3dB
Noise Less than -80dB
Distortion About -75dB unadjusted. Mostly 2nd harmonic.

Also known as

  • SSL Logic FXG 384
  • Alan Smart Research C2 Stereo Compressor
  • Danfield 726
Images
The SSL Clone
The SSL Clone
Capacitors
Value Count Type LS Designators Note  
22u
14
Electrolytic
 
 
25V
100u
4
Electrolytic
 
 
25V
1000u
2
Electrolytic
 
 
63V
470n
5
Tantalum
 
 
35V
6u8
1
Tantalum
 
 
35V
10p
1
Ceramic
5
 
 
22p
2
Ceramic
5
 
 
33p
4
Ceramic
5
 
 
100p
9
Ceramic
5
 
 
100n
25
Polyester/Mylar
5
 
63V
Resistors
Value Count Type Designators Note  
10
2
1%
 
 
47
2
1%
 
 
68
2
1%
 
 
100
6
1%
 
 
120
2
1%
 
 
470
5
1%
 
 
820
1
1%
 
 
1k
7
1%
 
 
2k
1
1%
 
 
2k7
1
1%
 
 
3k9
3
1%
 
 
8k2
1
1%
 
 
10k
10
1%
 
 
15k
3
1%
 
 
20k
3
1%
 
 
22k
8
1%
 
 
27k
3
1%
 
 
33k
1
1%
 
 
47k
7
1%
 
 
56k
1
1%
 
 
22k
8
1%
 
 
27k
3
1%
 
 
33k
1
1%
 
 
47k
7
1%
 
 
56k
1
1%
 
 
22k
8
1%
 
 
27k
3
1%
 
 
33k
1
1%
 
 
47k
7
1%
 
 
56k
1
1%
 
 
68k
1
1%
 
 
82k
1
1%
 
 
90k9
1
1%
 
 
100k
2
1%
 
 
127k
1
1%
 
 
180k
1
1%
 
 
220k
1
1%
 
 
270k
3
1%
 
 
470k
1
1%
 
 
510k
1
1%
 
 
560k
1
1%
 
 
620k
2
1%
 
 
750k
1
1%
 
 
1m
3
1%
 
 
1m2
2
1%
 
 
1m8
1
1%
 
 
3m3
1
1%
 
 
3m9
1
1%
 
 
5k
1
Trimpot
 
 
50k
2
Trimpot
 
 
47k
2
Potmeter lin
 
or 50k
IC sockets
Type Needed
DIL-8
DIL-8
7
DIL-14
DIL-14
1
SIL-8
SIL-8
3
 

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