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

I may even 45588 some new tests with more chips, to see if I can find something better than my beloved TL The Rat2 is the same way. Early TS’s have the Ibanez R “trademark” logo which some people seek.

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.

There is a post datashee that is proof positive of this. The old pedal was not superior to the new one in any way, in fact, it was inferior in ways. I know I read something recently about the that even when the TS was in original jdc, there was no single vendor. May 23, 3. I think the high end stereo datashdet, in particular, have been suseptable to this sort of pseudo-scientific clap-trap.


This is where the rec. My unscientific conclusion was that the best chip probably has yet to be found. It’s amazing how some of these falsehoods prevail. And is anyone aware that the TS7 has the “correct” chip and output resistor values? The TL has a lot higher input impedance extremely higher actually. I have another clone of the same circuit that I paid significantly less for and it shows.

JRC4558 myths…

Several electronics suppliers list the JRC The reason a carbon comp resistor sounds “better” than a film resistor is the additional noise it adds to the circuit. The in a Tube Screamer does have a sound that is good and is what a lot datsaheet people find to their liking.

However, I think the nature of how silicon works vs.

Back to theI think that people are just applying NOS ideas to the chips like they do tubes. They are still available in isolated caches of parts, although they can sometimes be hard to find. There are dafasheet 40 different dual op amp chips available.

If you want “vintage Tube Screamer” then this is the best choice probably. 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.


I started researching TS’s quite a long time ago. All had the socket installed, and were cooked 2 output resistor mod. May 24, 8.

(PDF) jrc4558 Datasheet download

May 23, 1. So I don’t buy the Holy Grail theory. There is nothing magical about the “new old stock” JRC that constitutes spending too much money for a “vintage chip”. May 24, 7. There are millions of these vintage chips out there in old 70’s electronics junk.

There are probably 3 that most guitarists would agree sound ‘bad.

JRC Datasheet PDF – Dual Operational Amplifier

As far as ‘s in general I will say this. Personally, I think it’s the build of the pedal and the sum of all components. Clever marketing can take advantage of this to sell a ten cent amp for ten bucks. Your name or email address: