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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(PDF) jrc4558 Datasheet download

I don’t think I went overboard with the cost on this one. I liked the 3 listed above enough to ‘splurge’ and order about 15 of each. I think the high end stereo guys, in particular, have been suseptable to this sort of pseudo-scientific clap-trap. Definitely better than some of the garbage op amps that were used in the early TS9 reissues.

May 23, 2. There are millions of datasheft 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? If you want “vintage Tube Screamer” then this is the best choice probably. I wish I could say that it sounded noticably better but the TL that I put in the amp did!

JRC D – PDF Datasheet – General Purpose Amplifiers In Stock |

Robbie WMay 24, I don’t think we’ll see a pedal guru doing any sort of semi-scientific chip preference test any time soon though May 24, 6. By all reports, the current manufacture JRCD’s sound just as good as the ones current with the manufacture of the original tube screamers. 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.


The reason that I even started this thread was to try to get a feel on where the whole TS mojo thing stands. The TL has a lot higher input impedance extremely higher actually. Ben HarmlessJun 4, However, I think the nature of how silicon works vs.

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. On the other hand, “better” and “vintage” aren’t necessarily the same thing, even though they get jumbled together in our sorry little heads. And, of course, this is because they all meet the same specifications.

I sent Analogman my TS-9 several years ago and had him replace the chip and beef up some weak spots datashset no other mods and it came back as he described: 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 455 time to sell chips or small parts. By all reports, these sound as good as the original.

They are still available in isolated caches of parts, although datasheeet can sometimes be hard to find. There is a post above that is proof positive of this. There is nothing magical about the “new old stock” JRC that constitutes spending too much money for a “vintage chip”.

There are over 40 different dual op amp chips available. 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.


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. There are other factors like the slew rate that may contribute as well, but to me the input impedance difference is the biggie.

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

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

Both have the JRC May 24, Several electronics suppliers list the JRC I have another clone of the same circuit that I paid significantly less for and it shows. It’s amazing how some of these falsehoods prevail. It’s a demonstrable fact datasheef the tone quality of op amps varies significantly.

Remove the compensation cap and put a TL in there with the rest of the circuit unmodded and it sounds awful. In addition, 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.

Last modified: April 25, 2020