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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There were zillions of the real “JRC” made when it was current. I know I read something recently about the that even when the TS was in original production, there was no single vendor. When you order these, you get parts that are labeled “JRC”.

The reason a carbon comp resistor sounds “better” than a film resistor is the additional noise it adds to the circuit. Sorry to kick over any sacred cows but this is just my opinion based on my experience. The catasheet that I even started this thread was to try to get 455p8 feel on where datashee whole TS mojo thing stands. I put this in the same piles as some of the datassheet, resistor and conductor stuff floating around. 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 liked the 3 listed above enough to ‘splurge’ and order about 15 of each. There are probably 3 that most guitarists would agree sound ‘bad.

The thing is, op amps are actually fairly complicated devices internally, and can have widely varying behaviors for slew rate, noise, etc, while being “rated” the same in identical conditions. All of the ‘ variants sounded quite similar and ‘good’. The TL drives things harder and it is tighter and crisper. They were consistently good.


JRC4558 myths…

And is anyone aware that the TS7 has the “correct” chip and output resistor values? Put a TL in there and be prepared for an overly bright and brittle sound.

Ben HarmlessJun 4, TL my fave The LT was also kinda cool sounding, but not consistently so in the handful of pedals that I tried it in. Early TS’s have the Ibanez R “trademark” logo which some people seek.

I don’t think I went overboard with the cost on this one. The clone had premium caps as well. Definitely better than some of the garbage op amps that were used in the early TS9 reissues.

I think the high end stereo guys, in particular, have been suseptable to this sort of pseudo-scientific clap-trap. The Rat2 is the same way. My unscientific conclusion was that the best chip probably has yet to be found.

Jun 3, So I don’t buy the Holy Grail theory.

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. Jun 4, May 24, 5. I attribute the superior tone to the builder of the box. May 24, 9. Remove the compensation cap and put a TL in there with the rest of the circuit unmodded and it sounds awful.

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

This is where the rec. They had nothing in common. 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: May 23, 4.


HWD4558 Datasheet

Even the slew rates, which some believe gives a hint to what makes the ‘ good, were all different. What have y’all overheard at the musician’s watercooler discussions? That’s one o’ them boxes what makes yer amp sound real loud innit? Do you already have an account? There’s a tremendous difference between being able to detect a difference and being able to specify the cause datashret the difference.

The TL has a lot higher input impedance extremely higher actually. May 23, 1.

P Datasheet PDF – KEC

I wish I could say that it sounded noticably better but the TL that I put in the amp did! We have all gotten used to that noise, so it sounds better. Conversion to TS – this seems to be a perennial hot one. 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 will go as far to say ALL ‘s sound so similar I doubt anyone could hear a difference in a blindfold test. The old pedal was not superior to the new one in any way, in fact, it was inferior in ways. May 24, 7. It’s a little relieving to know that some of the opamp chip gurus were willing to let this out of the bag. Personally, I think it’s the build of the pedal and the sum of all components.

May 24, 8. And I started probing really deep around the time that Analogman started offering their wares, oddly enough.