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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JRC Datasheet pdf – = NJM / Dual Operational Amplifier – New Japan Radio

People are building clones and ditching their ‘real deals’ datasbeet they sound jrv. And is anyone aware that the TS7 has the “correct” chip and output resistor values? I tested about 25 different chips back in ’99, in a few 9’s, a few 5’s, and a clone. I sent Analogman my TS-9 several years ago and had him replace the chip and beef up some weak spots with no other mods and it came back as he described: Definitely darasheet than some of the garbage op amps that were used in the early TS9 reissues.

Put a TL in there and be prepared for an overly bright and brittle sound. Yes, my password is: However, I think the nature of how silicon works vs. There are probably 3 that most guitarists would agree sound ‘bad. I liked the 3 listed above enough to ‘splurge’ and order about 15 of each. All had the socket installed, and were cooked 2 output resistor mod.

Your name or email address: The reason a carbon comp resistor sounds “better” than a film resistor is the additional noise it adds to the circuit. May 23, 4. Back when my vintage Rat II died and I needed jjrc replacement, I was kind of shocked just how inferior the current production Rats are – and the only substantial difference is the op amp. I’m just wondering where jrcc currently stand.


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. Some circuits sound better with inferior spec’ed chips. They had nothing in common. On the other hand, “better” and “vintage” aren’t necessarily the same thing, even though they get jumbled together in our sorry little heads. I datasehet researching TS’s quite a long time ago. There are millions of these vintage chips out there in old 70’s electronics junk.

JRC4558 myths…

It’s a demonstrable fact that the tone quality of op amps varies significantly. The in a Tube Screamer does have a sound that is good and is what a lot of people find to their liking. Robbie WMay 24, I will go as far to say ALL ‘s sound so similar I doubt anyone could hear a difference in a blindfold test.

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

The clone had premium caps as well. May 24, 8. 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. I may even run some new tests with more chips, to see if I can find something better than my beloved TL When you order these, you get parts that are labeled “JRC”.

May 24, Personally, I think it’s the build of the pedal and the sum of all components. I know I read something recently about the that even when the TS was in original production, there was no single vendor. Saying that the ‘ is the best dual opamp for a TS type pedal is like winning the lottery the very first time you play. 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.


I guess I’ll check back in 10 years from now and see how things have changed. If you want “vintage Tube Screamer” then this is the best choice probably.

The TL has a lot higher input impedance extremely higher actually. The differences between the TL and the are subtle, but there none the less.

It’s a little relieving to know that some of the opamp chip gurus were willing to let this out of the bag. May 24, 7.

We have not lost technology over the years, like we have with tubes, we have taken the same technology and made it cleaner in the case xatasheet silicon. These 3, datashwet particular, sounded really, really good. I have another clone of the same circuit that I paid significantly less for and it shows.

Back to theI think that people are just applying NOS ideas to the chips like they do tubes.

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