The JRC integrated circuit by Japan Radio Company is a dual high gain operational amplifier internally compensated and constructed on a single silicon . GENERAL DESCRIPTION. □ PACKAGE OUTLINE. The NJM/ integrated circuit is a dual high-gain operational amplifier internally. See detailed ordering and shipping information in the package dimensions section on page 10 of this data sheet. ORDERING INFORMATION. 1. TSSOP −

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Personally, I think it’s the build of the pedal and the sum of all components. May 24, 6. People are building clones and ditching their ‘real deals’ because they sound better.

I feel this is the primary reason for the audible differences. May 23, 3. I’m just wondering where things currently stand. Pinout can vary by different types so allways check from datasheet These are the pins in test datashret CMOS Technology file 1.

These 3, in particular, sounded really, really good. They are still available in isolated caches of parts, although they can sometimes be hard to find. I started datasheft TS’s quite a long time ago.


(PDF) JRC4558 Datasheet download

I tested about 25 different chips back in ’99, in a few 9’s, a few 5’s, and a clone. Both have the JRC How reliable is it?

One of the 9’s was beefed up with better i. The time now is 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.

The TL has a lot higher input impedance extremely higher actually. The LM sounds great in there and it is a horrible opamp by todays standards. Sorry to kick over any sacred cows but this is just my opinion based on my experience.

PNP transistor not working 2.

If you want “vintage Tube Screamer” then this is the best choice probably. I don’t think I went overboard with the cost on this one. They had nothing in common.

Remove the compensation cap and put a TL in there with the rest of the circuit unmodded and it sounds awful. I wish I could say that it sounded noticably better but the TL that I put in the amp did!

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. They were consistently good. On the other hand, “better” and “vintage” aren’t necessarily the same thing, even though they get jumbled together in our sorry little heads.


How to test the IC having part no. ” D ” ?

Log in or Sign up. Distorted Sine output from Transformer 8. I think the high end stereo guys, in particular, have been suseptable datashee this sort of pseudo-scientific clap-trap. All had the socket installed, and were cooked 2 output resistor mod. The in a Tube Screamer does have a sound that is good and is what a lot of people find to their liking. Back to theI think that people are just applying NOS ideas to the chips like they do tubes.

May 24, 5. I didn’t overhear anything.

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 4558e is cheapest at the moment.