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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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I started researching TS’s quite a long time ago. 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. These 3, in particular, sounded really, really good. May 24, 5. Jun 3, Back when my vintage Rat II died and I needed a replacement, I was kind of shocked just how inferior the current production Rats are – and the only substantial difference is the op amp.

If you hear a difference then by all means go with what sounds best to you.

JRC Datasheet PDF – Dual Operational Amplifier

May 24, 7. By all reports, dayasheet current manufacture JRCD’s sound just as good as the ones current with the manufacture of the original tube screamers. Remove the compensation cap and put a TL in there with the rest of the circuit unmodded and it sounds awful.

The in a Tube Screamer does have a sound that is good and is what a lot of people find to their liking. Jr you’re doing this to a TS 10, short out the 1K resistor leading to pin 3 of the dual opamp as well. Oh, and I should add that it’s unlikely listeners will “get the chips right” in say, blind testing between xatasheet JRC and new Fairchild. Log in or Sign up. However, I think the nature of how silicon works vs. And I started probing really deep around the time that Analogman started offering their wares, oddly enough.


Some circuits sound better with inferior spec’ed chips.

The clone had premium caps as well. TL my fave The LT was also kinda cool sounding, but not consistently so in the handful of pedals that I tried it in. I know I read something recently about the that even when the TS was in original production, there was no single vendor.

People are building clones and ditching their ‘real deals’ because they sound better. 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.

Great points made, truly. 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.

May 24, 8. There are over 40 different dual op amp chips available. The Rat2 is the same way.

I attribute the superior tone to the builder of the box. And is anyone aware that the TS7 has the “correct” chip and output resistor values? There are probably 3 that most guitarists would agree sound ‘bad. 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.

All had the socket installed, and were cooked 2 output resistor mod. I yanked it out and put it in my TS5. It’s a little relieving to know that some of the opamp chip gurus were willing to let this out of the bag. Jun 4, This is where the rec. I’m just curious, because most pedal experts seem to concur that both old and current production chips from different parts of Asia all tend to sound consistently the same.


As far as ‘s in general I will say this.

Ben HarmlessJun 4, And, of course, this is because they all meet the same specifications. There’s a tremendous difference between being able to detect a difference and being able to specify the cause of the difference. We have all gotten used to that noise, so it sounds better. There were zillions of the real “JRC” made when it was current. So I don’t buy the Holy Grail theory.

(PDF) jrc4558 Datasheet download

May 24, 9. Does true “New Old Stock” matter? That’s one o’ them boxes what makes yer amp sound real loud innit? All of the ‘ variants sounded dqtasheet similar and ‘good’. 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.

When you order these, you get parts that are labeled “JRC”. There is nothing magical about the “new old stock” JRC that constitutes spending too much money for a “vintage chip”. I put this in the same piles as some of the capacitor, resistor and conductor stuff floating around. Back to theI think that people are just applying NOS ideas to the chips like they do tubes. If you want “vintage Tube Screamer” then this is the best choice probably.

There are millions of these vintage chips out there in old 70’s electronics junk.