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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JRC4558 Dual Op Amp IC
Even the slew rates, which some believe gives a hint to what makes the ‘ good, were all different. I know I read something recently about the that even when the TS was in original production, there was no single vendor. It’s amazing how some of these falsehoods prevail. They were consistently good. 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?
I’m just wondering where things currently stand. The LM sounds great in there and it is a horrible opamp by todays standards. TL my fave The LT was also kinda cool sounding, but not consistently so in the handful 5458 pedals that I tried it in.
JRC NJM, JRC Datasheet –
Personally, I think it’s the build of the pedal and the sum of all components. May 24, 5. All of the ‘ variants sounded quite similar and ‘good’. They are still available in isolated caches of parts, although they can sometimes be hard fatasheet find. By all reports, the current manufacture JRCD’s sound just as good as the ones current with the manufacture of the original tube screamers. Ben HarmlessJun 4, Log in or Sign up.
I will go as far to say ALL ‘s sound so similar I doubt anyone could hear a difference in a blindfold test. 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. Several electronics suppliers list the JRC May 23, 3. On the other hand, jrrc and “vintage” aren’t necessarily the same thing, even though they get jumbled together in our sorry little heads.
May 24, 9. Does true “New Old Stock” matter? 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. We have all gotten used to that noise, so it sounds better.
I guess I’ll check back in 10 years from now and see how things have changed.
Great points made, truly. And, of course, this is because they all meet the same specifications. There are over 40 different dual op amp chips available.
Remove the compensation cap and put a TL in there with the rest of the circuit datasheef and it sounds awful. Yes, my password is: If you’re doing this to a TS 10, short out the 1K resistor leading to pin 3 of jrv dual opamp as well. There is some confusion at present over what is a true or “vintage” JRC However, I think the nature of how silicon works vs. Early TS’s have the Ibanez R “trademark” logo which dtasheet people seek.
If you hear a difference then by all means go with what sounds best to you. What have y’all overheard at the musician’s watercooler discussions? There were zillions of the real “JRC” made when it was current. May 24, 7. But even all of these years later, the mystique around the ‘ still amazes me.
JRC Datasheet pdf – = NJM / Dual Operational Amplifier – New Japan Radio
Sorry to kick over any sacred daatasheet but this is just my opinion based on my experience. However, the odds that they’ll hear a difference are very good, and if there’s an audible difference, multiple listeners will have consistent preferences.
May 23, 4. May 23, 1.
(PDF) jrc4558 Datasheet download
May 24, 8. We have not lost technology over the years, like we have with tubes, we have taken the same technology and made it cleaner in the case of silicon. There is a post datqsheet that is proof positive of this. By all reports, these sound as good as the original.
I have another clone of the same circuit that I paid significantly less for and it shows. I sent Analogman my TS-9 several years ago and had him replace the chip and beef up some weak spots with no other mods and it came back as he described: I don’t think we’ll see a pedal guru doing any sort of semi-scientific chip preference test any time soon though There’s a tremendous difference between being able to detect a difference and being able to specify the cause of the difference.