Texas Instruments P Operational Amplifiers – Op Amps are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for Texas. P Semiconductors are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for P Semiconductors. Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current.

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It’s a demonstrable fact that the tone quality of op amps varies significantly.

Your name or email address: Log in or Sign up. By datssheet reports, the current manufacture JRCD’s sound just as good as the ones current with the manufacture of the original tube screamers. 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.

I liked the 3 listed above enough to ‘splurge’ and order about 15 of each. But I beleive the old JRC version is the holy grail of some even though the actual chip in some of the originals eatasheet be made by others.

There is a post above that is proof positive of this. However, the odds that they’ll hear a difference are very good, and if there’s an audible dataheet, multiple listeners will have consistent preferences. I don’t think we’ll see a pedal guru doing any sort of semi-scientific chip preference test datasheeet time soon though Some circuits sound better with inferior spec’ed chips. The LM sounds great in there and it is a horrible opamp by todays standards.

dagasheet I didn’t overhear anything. There are probably 3 that most guitarists would agree sound ‘bad. The reason a carbon comp resistor sounds “better” than a film resistor is the additional noise it adds to the circuit. This is where the rec. It’s amazing how some of these falsehoods prevail.


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

RCP ICs – in stock to buy, photo, pdf datasheet, rfq, obsolete

I attribute the superior tone to the builder of the box. Does true “New Old Stock” matter? The Datashet is the same way. The TL drives things harder and it is tighter and crisper. I will go as far to say ALL ‘s sound so similar I doubt anyone could hear a difference in a blindfold test.

I yanked it out and put dztasheet in my TS5. There are other factors like the slew rate that may contribute as well, but to me the input impedance difference is the biggie.

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The clone had premium caps as well. They had nothing in common. I then went on to check the specs of each ‘good’ chip.

You must log in or sign up to reply here. Definitely better than some of the garbage op amps that were used in the datasheeh TS9 reissues.

And, of course, this is because they all meet the same specifications.

4558P Datasheet

Even the slew rates, which some believe gives a hint to what makes datasheft ‘ good, were all different. We have all gotten used to that noise, so it sounds better. I don’t think I went overboard with the cost on this one. The differences between the TL and the are subtle, but there none the less.

Conversion to TS – this seems to be a perennial hot one. Early TS’s have the Ibanez R “trademark” logo which some people seek. I started researching TS’s quite a long time ago. 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 have time to sell chips or small parts.


JRC4558 myths…

Are the misinformed still spending 30 bucks or more for a “NOS” chip, and 2 “brown sound” resistors? By all reports, these sound as good as the original.

TL my fave The LT was also kinda cool sounding, but not consistently so in the handful of pedals that I tried it in. Robbie WMay 24, No, create an account now. There is some confusion at present over what is a true or “vintage” JRC There’s datasheeet tremendous difference between being able to detect a difference and being able to specify the cause of the difference. Great points made, truly. Personally, I think it’s the build of the pedal and the sum of all components.

There are millions of these vintage chips out there in old 70’s electronics junk. Jun 3, The TL has a lot higher input impedance extremely higher actually. 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.

I have another clone of the same circuit that I paid significantly less for and it shows. When you order these, you get parts that are labeled “JRC”. I may even run some new tests with more chips, to see if Dqtasheet can find something better than my beloved TL