<ul><li><a href="https://en.wikipedia.org/wiki/en:Kay_Musical_Instrument_Company" class="extiw" title="w:en:Kay Musical Instrument Company">Kay</a>  <a rel="nofollow" class="external text" href="http://johannburkard.de/blog/music/effects/Revised-revised-Kay-Fuzz-Tone-schematics.html">Fuzz Tone</a></li></ul>
<ul><li><a href="//commons.wikimedia.org/wiki/File:Pedals_(2006-09-28)_by_Johann_Burkard.jpg" title="File:Pedals (2006-09-28) by Johann Burkard.jpg">Pedals_(2006-09-28)_by_Johann_Burkard.jpg</a>: <a rel="nofollow" class="external text" href="https://www.flickr.com/people/97468729@N00">Johann</a></li>
<li>derivative work: <a href="//commons.wikimedia.org/wiki/User:Guitarpop" title="User:Guitarpop">Guitarpop</a> (<a href="//commons.wikimedia.org/wiki/User_talk:Guitarpop" title="User talk:Guitarpop"><span class="signature-talk">talk</span></a>)</li></ul>
CC BY 2.0
<ul><li><a href="//commons.wikimedia.org/wiki/File:Pedals_(2006-09-28)_by_Johann_Burkard.jpg" title="File:Pedals (2006-09-28) by Johann Burkard.jpg">Pedals_(2006-09-28)_by_Johann_Burkard.jpg</a></li></ul>