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. All of the ‘ variants sounded quite similar and ‘good’.

If you hear a difference then by all means go with what sounds best to you. The reason that I even started this datasueet was to try to get a feel on where the whole TS mojo thing stands.

JRC Datasheet PDF – Dual Operational Amplifier

I may even run some new tests with more chips, to see if I can find something better than my beloved TL I will go as far to say ALL ‘s sound so similar Jec doubt anyone could hear a difference in a blindfold test.

The Rat2 is the same way.

Do you already have an account? Both have the JRC Jun 4, Saying that the ‘ is the best dual opamp for a TS type pedal is like winning the lottery the very first time you play.


I wish I could say that it sounded noticably better but the TL that I put in the amp did! Ben HarmlessJun 4, No, create an account now. I’m just wondering where things currently stand.

(PDF) jrc4558 Datasheet download

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. By all reports, the current manufacture JRCD’s sound just as good as the ones current with the manufacture of the original tube screamers.

There are other factors like the slew rate that may contribute as well, but to me the input impedance difference is the biggie. The clone had premium caps as well.

However, I think the nature of how silicon works vs. 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. Jrcc 23, 4. These 3, in particular, sounded really, really good. Early TS’s have the Ibanez R “trademark” logo which some people seek. But I beleive the old JRC version is the holy grail of some even though the actual chip in some of the originals may be made by others.


JRC Datasheet PDF – Dual Operational Amplifier

Remove the compensation cap and put a TL in there with the rest of the circuit unmodded and it sounds awful. May 24, 8. You must log in or sign up to reply here. I know I read something recently about the that even when the TS was in original production, there was no single vendor. Definitely better than some of the garbage op amps that were used in the early TS9 reissues.

It’s amazing how some of these falsehoods prevail. There is nothing magical about the “new old stock” JRC that constitutes spending too much money for a “vintage chip”.

May 23, 3. This is where the rec. There is a post above that is proof positive of this.

Sorry to kick over any sacred cows but this is just my opinion based on my experience. 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.

The in a Tube Screamer does have a sound that is good and is darasheet a lot of people find to their liking.