JRC datasheet, JRC pdf, JRC data sheet, datasheet, data sheet, pdf, New Japan Radio, = NJM / Dual Operational Amplifier. The JRC integrated circuit by Japan Radio Company is a dual high gain JRC Long Tailed Pair Differential Amplifier. . JRC Datasheet. Bookly Micro JRC datasheet, Dual Operational Amplifier (1-page), JRC datasheet, JRC pdf, JRC datasheet pdf, JRC pinouts.

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Both have the JRC There’s a tremendous difference between being able to detect a difference and being able to specify the cause of the difference. Does true “New Old Stock” matter?

I started researching TS’s quite a long time ago. Some circuits sound better with inferior spec’ed chips. May 23, 1. Remove the compensation cap and put a TL in there with the rest of the circuit unmodded and it sounds awful. The TL jrc44558 a lot higher input impedance extremely higher actually. I attribute the superior tone to the builder of the box. Dtasheet 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.

There are other factors like the slew rate that may contribute as well, but to me the datashet impedance difference is the biggie. I put this in the same piles as some of the capacitor, resistor and conductor stuff floating around. 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. Sorry to kick over datashet sacred cows but this is just my opinion based on my experience.

JRC4558 myths…

I’m just wondering where things currently stand. Personally, I think it’s the build of the pedal and the sum of dataeheet components. 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. Conversion to TS – this seems to be a perennial hot one. Yes, my password is: By all reports, these sound as good as the original.


The Rat2 is the same way. May 24, It’s amazing how some of these falsehoods prevail. 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. That’s one o’ them boxes what makes yer amp sound real loud innit?

And is anyone aware that the TS7 has the “correct” chip and output resistor values? Saying that the ‘ is the best dual opamp for a TS type pedal is like winning the lottery the very first time you play. May 24, jrc45558. I may even run some new tests with more chips, to see if I can find something better than my beloved TL I wish I could say that it sounded noticably better but the TL that I put in the amp did! May 24, 5. Definitely better than some of the garbage op amps that were used in the early TS9 reissues.

Are the misinformed still spending 30 bucks or more for a “NOS” chip, and 2 “brown sound” resistors? They had nothing in common.

(Datasheet) JRC pdf – w w w .d e e h s a t a . Dual Operational Amplifier (1-page)

TL my fave The LT was also kinda cool sounding, but not consistently datasgeet in the handful of pedals that I tried it in.

If you’re doing this to a TS 10, short out the 1K resistor leading to pin 3 of the dual opamp as well.


Put a TL in there and be prepared for an overly datasehet and brittle sound. 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? One of the 9’s was beefed up with better i.

Jun 3, I liked the 3 listed above enough to ‘splurge’ and order about 15 of each. The reason a carbon comp resistor sounds “better” than a film resistor is the additional noise it adds to the circuit.

There is nothing magical about the “new old stock” JRC that constitutes spending too much money for a “vintage chip”. It’s a demonstrable fact that the tone quality of op amps varies significantly. I don’t think I went overboard with the cost on this one.

Log in or Sign up. There are probably 3 that most guitarists would agree sound ‘bad. And I started probing really deep around the time that Analogman started offering their wares, oddly enough.

JRC4558 Dual Op Amp IC

There is some confusion at present over what is a true or “vintage” JRC There are millions of these vintage chips out there in old 70’s electronics junk. You must log in or sign up to reply here.

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

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