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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Log in or Sign up. May 23, 1. 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.

Are the misinformed still spending 30 bucks or more for a “NOS” chip, and 2 “brown dataasheet resistors? There are millions of these vintage chips out there in old 70’s electronics junk. And is anyone aware that the TS7 has the “correct” chip and output resistor values? It’s amazing how some of these falsehoods prevail. I’m just wondering where things currently stand. What have y’all overheard at the musician’s watercooler discussions?

May 23, 2. I didn’t overhear anything. 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: May 23, dataaheet. I know I read something recently about the that even when the TS was in original production, there was no single vendor. But I beleive the old JRC version jrx the holy grail of some even though the actual chip in some of the originals may be made by others.

And, of course, this is because they all meet the same specifications. I put this in the same piles as some of darasheet capacitor, resistor and conductor stuff floating around. I think the high end stereo guys, datahseet particular, have been suseptable to this sort of pseudo-scientific clap-trap. On the other hand, I also think we all at least I have personally tried some of the products on the idea of “if I can afford it, what can it hurt?

JRC NJM, JRC Datasheet –

The reason a carbon comp resistor sounds “better” than a film resistor is the additional noise it adds dattasheet the circuit. We have all gotten used to that noise, so it sounds better. Back to theI think that people are just applying NOS ideas to the chips like they do tubes. However, I think the nature of how silicon works vs. We have not lost technology over the years, like we have with tubes, we have taken the jtc technology and made it cleaner in the case of silicon.

May 23, 4. 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 45558 to sell chips or small parts.

Early TS’s have the Ibanez R “trademark” logo which some people seek. When you order these, you get parts that are labeled “JRC”.

By all reports, these sound as good as the original. There is some confusion at present over what is a true or “vintage” JRC Krc electronics suppliers list the JRC 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 were zillions of the real “JRC” made when it was current.


They are still available in isolated caches of parts, although they can sometimes be hard to find. Does true “New Old Stock” matter? In datasheey, 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.

Conversion to TS – this seems to be a perennial hot one. Datasheeg you’re doing this to a TS 10, short out the 1K resistor leading to pin 3 of the dual opamp as well. I yanked it datasheeet and put it in my TS5. I wish I could say that it sounded noticably better but the TL that I put in the amp did!

May 24, 5. I replaced the two output resistors datasyeet carbon film resistors I had laying around, and I just order a couple of new RCP’s for 25 cents a piece. I datasheeh think I went overboard with the cost on this one. May 24, 6. May 24, 7.

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.

JRC myths | Telecaster Guitar Forum

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.

On the other hand, “better” and “vintage” aren’t necessarily the same thing, even though they get jumbled together in our sorry little datasehet. It’s a demonstrable fact that the tone quality of op amps varies significantly.

Clever marketing can take advantage of this to sell a ten cent amp for ten bucks. What we could all really wish for is that large-scale pedal manufacturers would actually do LISTENING tests fatasheet these “identical” parts, rather than just buying whatever is cheapest at the moment.

May 24, 8. The old pedal was not superior to the new one in any way, in fact, it was inferior in ways. May 24, 9. May 24, 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. 458, 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’s a tremendous difference between being able to detect a difference and being able to specify the cause of the difference. This is where the rec. Great points made, truly.

The reason that I even started this thread was to try to get a feel on where the whole TS mojo thing stands. I started researching TS’s quite a long time ago.

And I started probing really deep around the time that Analogman started offering their wares, oddly enough. It’s a little relieving to know that some of the opamp chip gurus were willing to let this out of the bag. People are building clones and ditching their ‘real deals’ because they sound better.


There is a post above that is proof positive of this. But even all of these years later, the mystique around the ‘ still amazes me. Saying that the ‘ is the best dual opamp for a TS type pedal is like winning the lottery datasbeet very first time you play. There are over 40 different dual dqtasheet amp chips available.

There are probably 3 that most guitarists would agree sound ‘bad. I tested about 25 different chips back in ’99, in a few 9’s, a few 5’s, and a clone. All had the socket installed, and were cooked 2 output resistor mod. One of the 9’s was beefed up with better i. The clone had premium caps as well. All of the ‘ variants sounded quite similar and ‘good’.

These 3, in particular, sounded really, really good. TL my fave The LT was also kinda cool sounding, but not consistently so in the handful of pedals that I tried it in.

JRC4558 Dual Op Amp IC

I liked the 3 listed above enough to ‘splurge’ and order about 15 of each. They were consistently good. I then went on to check the specs of each ‘good’ chip. They had nothing in common. Even the slew rates, which some believe gives a hint to what makes the ‘ good, were all different.

My unscientific conclusion was that the best chip probably has yet to be found. I may even run some new tests with more chips, to see if Datasheef can find something better than my beloved TL I don’t think we’ll see a pedal guru doing any sort of semi-scientific chip preference test any time soon though I guess I’ll check back in 10 years from now and see how things have changed.

The differences between the TL and the are subtle, but there none the less. The TL has a lot higher input impedance extremely higher actually. I feel this is the primary reason for the audible differences. 4585 are other factors like the slew rate that may contribute as well, but to me the input datwsheet difference is the biggie. The TL drives things harder and it is tighter and crisper.

The in a Tube Screamer does have a sound that is good and is what a lot of people find to their liking. If you want “vintage Tube Screamer” then this is the best choice probably. Definitely better than some of the garbage op amps that were used in the early TS9 reissues. Some circuits sound better with inferior spec’ed chips. Put a TL in there and be prepared for an overly bright and brittle sound. The Rat2 is the same way.

Remove the compensation cap and put a TL in there with the rest of the circuit unmodded and it sounds awful. The LM sounds great in there and it is a horrible opamp by todays standards.