Searching for JRC 4558D OP-AMP chips from the 80s- any leads?

**daOnlyBG** · 08-13-2018, 12:22 PM

Hello all. I'm brand new to the forums. I hope this is the appropriate place to ask the following question.

I'd like to ask if anyone here has experience in digging up op-amps from old electronics?

Specifically, I'm looking for an old JRC 4558D for a particular project I'm working on. I know you can find the new ones for dirt cheap on eBay, but I'd like to locate one from the 80s. I could pay $30 on eBay, but I figure I'd try my hand looking through old electronics first and, you know, not pay $30, haha.

Any one has any tips?

**eesakiwi** · 08-15-2018, 07:18 AM

Has something to do with electric guitars, sought after for its original unique sound

https://www.electrosmash.com/jrc4558-analysis
JRC4558 Analysis
The JRC4558 integrated circuit by Japan Radio Company is a dual operational amplifier internally compensated and constructed with bipolar transistors on a single silicon chip. The high voltage gain (100 dB typ.), good input impedance (5 MΩ typ.) and versatile power supply (± 4 to 18 Volts) make it perfect to fit in pedal circuit designs. This chip has industry standard pinout, meaning that there are several different suppliers manufacturing pin compatible 4558 devices and also it can replace other standard dual op-amps like the TL072, NE5532 or the OPA2134. The first RC4558 monolithic dual opamp was developed by Raytheon Semiconductors in 1974.

The 4558 dual amp is linked with the history of the guitar pedals development. Many designers included this part in some of the most successful effects like the Orange Squeezer, DOD YJM 30, Boss OD1, Tube Screamer or Peavey equipment.

**msmoorad** · 08-15-2018, 08:07 AM

so what are the commonly scrapped items this chip can be found in, if any?

**LoriNagle** · 09-17-2020, 10:32 AM

I don't like JRC4558, it is Scratchy, cruel, NOISEY, excessively midrangey and they just seriously need detail. When contrasting them with the NE5532, OPA2228 and OPA2604, the 4558 IMO is totally embarrassed. Those chips have nearer specs to a 12AX7 cylinder and furthermore stable/perform sooooo much better. At the point when I play arpeggios through a circuit containing a 4558, there is such an absence of detail and roughness that it would be humiliating in a live presentation.

Searching for JRC 4558D OP-AMP chips from the 80s- any leads?

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