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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Remove the compensation cap and put a TL in there with the rest of the circuit unmodded and it sounds awful. Log in or Sign up. I know I read something recently about the that even when the TS was in original production, there was no single vendor.

May 24, 7. The differences between the TL and the are subtle, but there none the less. Conversion to 45558 – this seems to be a perennial hot one.

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. There is some confusion at present over what is a true or “vintage” JRC I started researching TS’s quite a long time ago.

Does true “New Old Stock” matter? Are the misinformed still spending 30 bucks or more for a “NOS” chip, and 2 “brown sound” resistors? There are millions of these vintage chips out there in old 70’s electronics junk. May 24, 9. Put a TL in there and be prepared for an overly bright and brittle sound.


The reason a carbon comp resistor sounds “better” than a film resistor is the additional noise it adds to the circuit. I feel this is the primary reason for the audible differences. 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.

All had the socket installed, and were cooked 2 output resistor mod. I may even run some new tests with more chips, to see if I can find something better than my beloved TL If you’re doing this to a TS 10, short out the 1K resistor leading to pin 3 of the dual opamp as well.

When you order these, you get parts that are labeled “JRC”. So I don’t buy the Holy Grail theory.

May 24, I don’t think I went overboard with the cost 4558 this 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. Robbie WMay 24, But even all of these years later, the mystique around the ‘ still amazes me.

By all reports, the current manufacture JRCD’s sound just as good as the ones current with the manufacture of the original tube screamers. We have all gotten used to that noise, so it sounds better. One of the 9’s was beefed up with better i.


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 Ddatasheet that I put in the amp did! Some circuits sound better with inferior spec’ed chips.

Jun 4, I put this in the same piles as some of the capacitor, resistor and conductor stuff floating around.

JRC4558 Dual Op Amp IC

Yes, my password is: Clever marketing can take advantage of this to sell a ten cent amp for ten bucks. May 24, 8. Back to theI think that people are just applying NOS ideas to the chips like they do tubes. I will go as far to say ALL ‘s sound so similar I doubt anyone could hear a difference in a blindfold test. This is where the rec. It’s amazing how some of these falsehoods prevail.

JRC Datasheet pdf – = NJM / Dual Operational Amplifier – New Japan Radio

There is nothing magical about the “new old stock” JRC that constitutes spending too much money dattasheet a “vintage chip”. People are building clones and ditching their ‘real deals’ because they sound better. Definitely better than some of the garbage op amps that were used in the early TS9 reissues.

They are still available in isolated caches of parts, although they can sometimes be hard to find.