JRC4558, worst op amp EVER.... - Page 2 - diyAudio
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Old 18th November 2005, 09:32 AM   #11
Raoul is offline Raoul  United States
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Join Date: Feb 2003
Location: OR
It's about the distortion in a pedal, like schnullimaus said. Supposed to sound tube-like.

I think Stevie Ray Vaughan used a pedal that utilized the JRC4558D. I guess you can play like Stevie as long as you have the right opamp...

This is kinda funny... http://cgi.ebay.com/IBANEZ-TUBE-SCRE...QQcmdZViewItem
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Old 18th November 2005, 05:01 PM   #12
Join Date: Nov 2005
You know the odd thing about the pedals using this chip, especially the tube screamer is they tend to be pedals people almost always modify. I'm willing to bet that along with all the mods Stevie had done to his, an opampectomy as one person coined it was part of the operation.

In all the guitar gear and stages I've used this op amp, it's been horrid. It was pleasing for a little while in my Crates distortion emulation circuit but after a month or two of use then switching back to the NE5532, the 5532 is superior beyond words.

Maybe it teams up with tube gear really well?
Maybe since a lot of tube gear has that ultra thick not so ronchy metal tone, the all around harshness of the 4558 adds bite to tube tone?
I think this when I hear how ronchy and brittle the Metal Zone is and it's one of the most popular pedals used with tube amps today.

I've got death metal pedal thread going. JRC4558's used twice in it. Due to the two chips and no gain control, this pedal is a well of noise and uselessness to a serious player. If it were modded though, I think it would be the most widely used pedal. An opampectomy and gain control modded into this pedal and I am willing to bet it is the closest thing to tube subtle overdrive there is. It's a tough call to be certain changing the 4558's won't take away from it's tubeness though. Based on my ears this pedal was someones flagship design based around this chip and they cut down the functions of the circuit because it was too damn good...
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