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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They had nothing in common. Great points made, truly. May 24, 5. Do you already have an account?

The old pedal was not superior to the new one in any way, in fact, it was inferior in ways. 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 wish I could say that it sounded noticably better but the TL that I put in the amp did! I started researching TS’s quite a long time ago. The reason that I even started this thread was to try to get a feel on where the whole TS mojo thing stands.

One of the 9’s was beefed up with better i. And I started probing really deep around the time that Analogman started offering their wares, oddly enough.

I tested about 25 different chips back in ’99, in a few 9’s, a few 5’s, and a clone. There are other factors like the slew rate that may contribute as well, but to me the input impedance difference is the biggie.


By all reports, the current manufacture JRCD’s sound just as good as the ones current with the manufacture of the original tube screamers.

May 24, 6. Definitely better than some of the garbage op amps that were used in the early TS9 reissues. Jun 4, I have another clone of the same circuit that I paid significantly less for and it shows.

On the other hand, “better” and “vintage” aren’t necessarily the same thing, even though they get jumbled together in our sorry little heads. I don’t think I went overboard with the cost on this one. There is a post above that is proof positive of this. I attribute the superior tone to the builder of the box.

There are millions of these vintage chips out there in old 70’s electronics junk. I didn’t overhear anything. The in a Tube Screamer does have a sound that is good and is what a lot of people find to their liking. So I don’t buy the Holy Grail theory.

JRC NJM, JRC Datasheet –

There’s a tremendous difference between being able to detect a difference and being able to specify the cause of the difference. Back when my vintage Rat II died and I needed a replacement, I was kind of shocked just how inferior the current production Rats are – and the only substantial difference is the op amp.

Yes, my password 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. You must log in or sign up to reply here. I’m just wondering where things currently stand. When you order these, you get parts that are labeled “JRC”. May 24, Several electronics suppliers list the JRC There are over 40 different dual op amp chips available.


This is where the rec. May 23, 2.

JRC4558 myths…

If you want a JRC chip for a project, get a new chip from Steve at Small Bear Electronics who sells them cheap darasheet we dont have time to sell chips or small parts.

If you want “vintage Tube Screamer” then this is the best choice probably. No, create an account now.

Conversion to TS – this seems to be a perennial hot one. 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.

Log in or Sign up. May 23, 1. Remove the compensation cap and put a TL in there with the rest of the circuit unmodded and it sounds awful. I yanked it out and put it in my TS5. Robbie WMay 24, What have y’all 455 at the musician’s watercooler discussions? There are probably 3 that most guitarists would agree sound ‘bad. All had the socket installed, and were cooked 2 output resistor mod.