Gyraf GSSL Buss Compressor

Revision for “Gyraf GSSL Buss Compressor” created on February 22, 2016 @ 14:21:13

Title
Gyraf GSSL Buss Compressor
Content
<p>The GSSL is a clone of the stereo buss compressor found in SSL4000-series desks.  Because of it's affordability and relatively low difficulty, the GSSL has become a very popular project with many PCBs and mods available.</p> <p>[gallery link="file" columns="4"]</p> <p style="text-align: right;"><span style="font-size: xx-small;">Images courtesy of Gyraf Audio and FiveFish Studios</span></p> <p><strong>Notable Features:</strong></p> <ul> <li>Designed for DBX202x or THAT2180/2181 VCAs</li> <li>Uses all modern easily sourceable components</li> <li>Ratio, attack, and release pots</li> </ul> <p><strong>Possible Modifications:</strong></p> <ul> <li>Turbo Mod <ul> <li>Changes the sidechain from summed (mono) to stereo.  This makes the GSSL behave more like the original SSL. </li> </ul> </li> <li>CRC Filter Mod <ul> <li>Fixes power hum problems inherent in the original GSSL design. </li> </ul> </li> <li>VU Meter Mod <ul> <li>Usually GSSL builders use a peak meter.  The VU meter makes the "feel" of the compressor closer to, say, the 1176. </li> </ul> </li> <li>Super Sidechain <ul> <li>Adds adjustable 60, 90, 130 &amp; 200hz high-pass filters, Tilt-Medium and Tilt-Loud sidechain eq curves, and the option for an external sidechain input. </li> </ul> </li> <li>Crush'n'Blend <ul> <li>Adds wet/dry mix control</li> </ul> </li> </ul> <p><strong>Price: </strong></p> <ul> <li>25€ for PCB from <a href="https://pcbgrinder.com/" target="_blank">PCB Grinder</a></li> <li>25€ for GSSL + super sidechain PCBs from <a href="http://www.pcbgrinder.com/" target="_blank">PCB Grinder</a></li> </ul> <p><strong>Modifications:</strong></p> <ul> <li>$9.95 for Turbo PCB from <a href="http://www.expataudio.com/" target="_blank">Expat Audio</a></li> <li>$30 for Turbo kit from DIY Parts Supply</li> <li>12€ for Super Sidechain PCB from <a href="http://www.groupdiy.com/index.php?topic=10776.0">Gustav</a></li> <li>$9.95 for VU Meter PCB from <a href="http://www.expataudio.com/" target="_blank">Expat Audio</a></li> <li>$6.95 for CRC PCB from <a href="http://www.expataudio.com/" target="_blank">Expat Audio</a></li> <li>$16 for CRC kit from DIY Parts Supply</li> </ul> <strong>More information:</strong> <ul> <li><a href="http://www.gyraf.dk" target="_blank">www.gyraf.dk</a>.</li> <li>A blog about building a GSSL.</li> <li>Five Fish's GSSL build <a href="http://www.fivefish.net/diy/SSL4000Compressor/page2.htm" target="_blank">blog </a>with sound clips.</li> </ul>
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February 22, 2016 @ 14:21:13 Peterson Goodwyn