<p>BBC microphones (The Beatles Story)
</p>
<ul><li>BBC/Marconi <b>Coles 4038</b> PGS (Pressure Gradient Single) Microphone
<dl><dd>PGS (pressure Gradient Single) microphone was designed by the BBC (founded by <a href="https://en.wikipedia.org/wiki/en:Marconi_Company" class="extiw" title="w:en:Marconi Company">Marconi</a>) and manufactured by <a rel="nofollow" class="external text" href="http://www.coutant.org/stc/index.html">STC</a> in 1951/1952 as type 4038.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1">[1]</a></sup> Also it may be manufactured by <a rel="nofollow" class="external text" href="http://www.coleselectroacoustics.com/">Coles</a>, and named Coles 4038.</dd></dl></li></ul><hr><h3><span class="mw-headline" id="References">References</span></h3>
<ol class="references"><li id="cite_note-1"><span class="mw-cite-backlink"><a href="#cite_ref-1">↑</a></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.historyofpa.co.uk/pages/microphones.htm#marconi1">The PGS ribbon microphone - Marconi - Microphones</a>. <i>The History of Public Address</i>. Yaxleys Sound Systems.</span>
</li>
</ol><ul><li><a rel="nofollow" class="external text" href="http://www.coutant.org/marconi/index.html">BBC-Marconi Technical and Research Processes Ltd</a></li>
<li>STC : <a rel="nofollow" class="external text" href="http://www.coutant.org/stc/">Standard Telephones and Calbes Limited</a></li>
<li>Coles : <a rel="nofollow" class="external text" href="http://www.coleselectroacoustics.com/">Coles Electroacoustics Ltd</a></li></ul><hr>
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/23755444@N00">Hens Zimmerman</a>
CC BY 2.0
originally posted to <b><a href="//commons.wikimedia.org/wiki/Flickr" class="mw-redirect" title="Flickr">Flickr</a></b> as <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/23755444@N00/4057857332">Beatles' Story museum, cool BBC microphones</a>