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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JRC4558 myths…

There are other factors like the slew rate that may contribute as well, but to me the input impedance difference is the biggie. The TL drives things harder and it is tighter and crisper. They had nothing in common.

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 23, 2. The TL has a lot higher input impedance extremely higher actually.

I think the high end stereo guys, in particular, have been suseptable to this sort of pseudo-scientific clap-trap. 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. May 23, 3. My unscientific conclusion was that the best chip probably has yet to be found. Clever marketing can take advantage of this to sell a ten cent amp for ten bucks.


Datasheet, PDF – Alldatasheet

Yes, my password is: That’s one o’ them boxes what makes yer amp sound real loud innit? If you hear a difference then by all means go with what sounds best to you. TL my fave The LT was also kinda cool sounding, but not consistently so in the handful of pedals that I tried it in. They were consistently good. There are over 40 different dual op amp chips available.

I started researching TS’s quite a long time ago.

JRC4558 Datasheet PDF

May 24, 6. I don’t think I went overboard with the cost on this one. I may even run some new tests with more chips, to see if I can find something better than my beloved TL If you’re dataasheet this to a TS 10, short out the 1K resistor leading to pin 3 of the dual opamp as well.

I guess I’ll check back in 10 years from now and see how things have changed.

JRC Datasheet PDF –

Log in or Sign up. It’s a little relieving to know that some of the opamp chip gurus were willing to let this out of the bag. Your name or email address: 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. No, create an account now. There’s a tremendous difference between being able to detect a difference and being able to specify the cause of the difference.


All had the socket installed, and were cooked 2 output resistor mod.

Are the misinformed still spending 30 bucks or more for a “NOS” chip, and jrc45588 “brown sound” resistors? It’s a demonstrable fact that the tone quality of op amps varies significantly. I feel this is the primary reason for the audible differences. May 24, 7. You must log in or sign up to reply here.

Oh, and I should add that dayasheet unlikely listeners will “get the chips right” in say, blind testing between vintage JRC and new Fairchild. May 24, 8.

I put this in the same piles as some of the capacitor, resistor and conductor stuff floating around. It’s amazing how some of these falsehoods prevail. May 24, The clone had premium caps as well. Back when my vintage Rat II died and I needed a replacement, Daatasheet was kind of shocked just how inferior the current production Rats are – and the only substantial difference is the op amp.