<html><head></head><body>It's a 741 type dual opamp, I believe. Also the
one causing a lot of hype in the "Tube Screamer" guitar stompbox, since
there are different varieties and they produce a different distortion sound
in the TS.<br>
Here's a Tube Screamer article that discusses the 4558 opamp.<br>
<pre><a class="moz-txt-link-freetext" href="http://www.geofex.com/Article_Folders/TStech/tsxfram.htm">http://www.geofex.com/Article_Folders/TStech/tsxfram.htm</a></pre>
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<br>
<br>
pin 1 out 1<br>
pin 2 -in 1<br>
pin 3 +in 2<br>
pin 4 -Vee<br>
pin 5 +in 2<br>
pin 6 -in 2<br>
pin 7 out 2<br>
pin 8 +Vcc<br>
<br>
<a class="moz-txt-link-abbreviated" href="mailto:ElmacacoX@aol.com">ElmacacoX@aol.com</a> wrote:<br>
<blockquote type="cite" cite="mid:fb.10390fe2.27924612@aol.com"><pre wrap="">Hi,<br><br>it's me tring to see why the congas don't work on my cr8000, and I am trying <br>to find the datasheet on the op amp IC marked 4558DD JRC 2424. I've tried <br>searching with google, but no luck. there are many 4558's in my sh-2 as <br>well, so it's a pretty common roland chip I imagine.<br><br>anyone have this?<br><br>thanks<br><br>Ed<br><br><br></pre>
</blockquote>
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<pre class="moz-signature">--
Scott Bernardi
<a class="moz-txt-link-abbreviated" href="mailto:sbernardi@home.net">sbernardi@home.net</a></pre>
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