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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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I put this in the same piles as some urc the capacitor, resistor and conductor stuff floating around. The old pedal was not superior to the new one in any way, in fact, it was inferior in ways.

I tested about 25 different chips back in ’99, in a few 9’s, a few 5’s, and a clone. This is where the rec. The LM sounds great in there and it is a horrible opamp by todays standards. They darasheet nothing in common.

I don’t think I went overboard with the cost on this one. All of the ‘ variants sounded quite similar and ‘good’. The TL drives things harder and it is tighter and crisper. The reason that I even started this thread was to try to get a feel on where the whole TS mojo thing stands.

JRC myths | Telecaster Guitar Forum

Some circuits sound better with inferior spec’ed chips. I wish I could say datasheft it sounded noticably better but the TL that I put in the amp did! If you hear a difference then by all means go with what sounds best to you. Jun 3, As far as ‘s in general I will say this. I attribute the superior tone to the builder of the box. We have all gotten used to that noise, so it sounds better. The differences between the TL and the are subtle, but there none the less.


There are other factors like the slew rate that may contribute as well, but to me the input impedance difference is the biggie. There were zillions of the real “JRC” made when it was current.

One of the 9’s was beefed up with better i. Back when my vintage Rat II died and I needed a replacement, I was kind of shocked just how inferior dtaasheet current production Rats are – and the only substantial difference is the op amp.

I’m just curious, because most pedal experts seem jrx concur that both old and current production chips from different parts of Asia all tend to sound consistently the same.

JRC4558 myths…

May 24, 7. Jdc you already have an account? I will go as far to say ALL ‘s sound so similar I doubt anyone could hear a difference in a blindfold test. They were consistently good. There are millions of these vintage chips out there in old 70’s electronics junk. When you order these, you get parts that are labeled “JRC”. 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.


JRC4558 Dual Op Amp IC

Yes, my password is: My unscientific conclusion was that the best chip probably has yet to be found. If you want “vintage Tube Screamer” then this is the best choice probably. Conversion to TS – this seems to be a perennial dxtasheet one. May 24, 8.

And I started probing really deep around the time that Analogman started offering their wares, oddly enough. I have another clone of the same circuit that I paid significantly less for and it shows.

The Rat2 is the same way. But even all of these years later, the mystique around the ‘ still amazes me. I feel this is the primary reason for the audible differences. I yanked it out and put it in my TS5.

If you’re doing this to a TS jc, short out the 1K resistor leading to pin 3 of the dual opamp as well. May 24, 6.

What have y’all overheard at the musician’s watercooler discussions? There is a post above that is proof positive of this. Saying that the ‘ is the best dual opamp for a TS type pedal is like winning the lottery the very first time you play.