The JRC integrated circuit by Japan Radio Company is a dual high gain operational amplifier internally compensated and constructed on a single silicon . JRC datasheet, JRC pdf, JRC data sheet, datasheet, data sheet, pdf, New Japan Radio, = NJM / Dual Operational Amplifier. jrc Datasheet PDF Download – Dual Operational Amplifier, jrc data sheet.

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If you’re doing this to a TS 10, short out the 1K resistor leading to pin 3 of the dual opamp as well. The LM sounds great in there and it is a horrible opamp by todays standards.

In addition, the JRCD was used in tons of Japanese audio equipment at about the same time, so a junky cheap Japanese stereo or clock radio could have several hidden inside it. Oh, and I should add that it’s unlikely listeners will “get the chips right” in say, blind testing between vintage JRC and new Fairchild. What we could all really wish for is that large-scale pedal manufacturers would actually do LISTENING tests on these “identical” parts, rather than just buying whatever is cheapest at the moment.

JRC NJM, JRC Datasheet –

It’s amazing how some of these falsehoods prevail. Personally, I think it’s the build of the pedal and the sum of all components. I then went on to check the specs of each ‘good’ chip. Robbie WMay 24, Great points made, truly. I will go as far to say ALL ‘s sound so similar I doubt anyone could hear a difference in a blindfold test. I think the high end stereo guys, in particular, have been suseptable to this sort of pseudo-scientific clap-trap. May 23, 1.


JRC myths | Telecaster Guitar Forum

What have y’all overheard at the musician’s watercooler discussions? You must log in or sign up to reply here.

However, I think the nature of how silicon works vs. I tested about 25 different chips back in ’99, in a few 9’s, a few 5’s, and a clone. May 24, 9.

I may even run some new tests with more chips, to see if I can find something better than my beloved TL There’s a tremendous difference between being able to detect a difference and being able to specify the cause dataseet the difference. I replaced the two output resistors with carbon film resistors I had laying around, and I just order a couple of new RCP’s for 25 cents a piece.

JRC4558 Dual Op Amp IC

I’m just wondering where things currently stand. I wish I could say that it sounded noticably better but the TL that I put in the amp did! Do you already have an account? Are the misinformed still spending 30 bucks or more for a “NOS” chip, and 2 “brown sound” resistors? I put this in the same piles as some of the capacitor, resistor and conductor stuff floating around.


The clone had premium caps as well. So I don’t buy the Holy Grail theory. The reason a carbon comp resistor sounds “better” than jtc film resistor is the additional noise it adds to the circuit. These 3, in particular, sounded really, really good. They were consistently good. May 24, 6.

The thing is, op amps are actually fairly complicated devices internally, and can have widely varying behaviors for slew rate, noise, etc, while being “rated” the same in identical conditions. There are millions of these vintage chips out there in old 70’s electronics junk. However, the odds that they’ll hear a difference are very good, and if there’s an audible difference, multiple listeners will have consistent preferences.

(PDF) jrc4558 Datasheet download

There are over 40 different dual op amp chips available. There is nothing magical about the “new datashewt stock” JRC that constitutes spending too much money for a “vintage chip”.

I attribute the superior tone to the builder of the box. If you want a JRC chip for a project, get a new chip from Steve at Small Bear Electronics who sells them cheap sorry we dont have time to sell chips or small parts. If you 44558 “vintage Tube Screamer” then this is the best choice probably.