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JRC 4559 not 4558


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3/15/2003 1:21 PM
Bjorn
JRC 4559 not 4558
I have an early Barber “Burn Unit” that I like a lot.  
The unit is very well built. Inside there is an OP-amp that is very similar looking to a JRC 4558.  
 
Dave has applied some black marking ink to disguise the numbering on top of the OP amp.  
Yesterday, I took some alcohol and removed the ink and discovered that the unit was marked JRC 4559D (9002D).  
I also dared to try tried the unit with different 4558DD's and that sounded real good as well.  
 
Does any one have any info on the JRC 4559D?  
What differences are there compared to a JRC 4558?  
 
Thanks,  
Bjorn
 
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3/15/2003 12:04 PM
Dai Hirokawa

This is the datasheet on their homepage:  
 
http://www.njr.co.jp/pdf/ae/ae04052.pdf  
 
Dai
 
3/15/2003 7:03 PM
Bjorn

Thank you Dai!  
 
Any idea why Barber would chose a 4559 over a 4558?  
 
Bjorn
 
3/15/2003 4:16 PM
marrk
Compare the "slew rate". Faster recovery is better. That is why a 1448 chip sounds lousy. It is much slower than either 4558 or 4559. Mark
 
3/15/2003 7:07 PM
Bjorn

Thank you both!  
 
Bjorn
 
3/17/2003 3:22 PM
ed guidry
4559 has a higher input impedance. I don't think the burn unit has an input buffer, as the early version is supposed to be identical to Orman's Son of Screamer.  
The output is supposed to be able to drive loads better as well.  
I tried it in a circuit and found it had a nice tone, expanded bottom end compared to the 4558.
 
3/19/2003 8:51 PM
Leiter
"Compare the "slew rate". Faster recovery is better. That is why a 1448 chip sounds lousy. It is much slower than either 4558 or 4559."  
 
Why not go to a TL07x, for a slew rate 13 times faster?
 

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