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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The reason that I even started this thread was to try to get a feel on where the whole TS mojo thing stands. The LM sounds great in there and it is a horrible opamp by todays standards. Ben HarmlessJun 4, And I started probing really deep around the time that Analogman started offering their wares, oddly enough.

Korea Electronics (KEC)

These 3, in particular, sounded really, really good. Put a TL in there and be prepared for an overly bright and brittle sound. On the other hand, “better” and “vintage” aren’t necessarily the same thing, even though they get jumbled together in our sorry little heads.

If you want a JRC chip for a project, dataseet a new chip from Steve at Small Bear Electronics who sells them cheap sorry we dont have time to sell chips or small parts. Some circuits sound better with inferior spec’ed chips. All had the socket installed, and were cooked 2 output resistor mod. So I don’t buy the Holy Grail theory. TL my fave The LT was also kinda cool sounding, but not consistently so in the handful of pedals that I tried it in.

P Datasheet PDF – KEC

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. However, I think the nature of how silicon works vs. It’s a demonstrable fact that the tone datazheet of op amps varies significantly.


It’s amazing how some of these falsehoods prevail.

Cheap 4558 datasheet deals

They had nothing in common. They were consistently good. May 23, 4. May 23, 2. May 23, 1.

May 24, 8. Jun 3, There’s a tremendous difference between being able to detect a difference and datasyeet able to specify the cause of the difference. The TL drives things harder and it is tighter and crisper.

I yanked it out and put it in my TS5. Xatasheet, the odds that they’ll hear a difference are very good, and if there’s an audible difference, multiple listeners will have consistent preferences.

And, of course, this is because daatsheet all meet the same specifications. I guess I’ll check back in datssheet years from now and see how things have changed. I put this in the same piles as some of the capacitor, resistor and conductor stuff floating around.

Clever marketing 4558p take advantage of this to sell a ten datadheet amp for ten bucks. If you’re doing this to a TS 10, short out the 1K resistor leading to pin 3 of the dual opamp as well. 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.

Jun 4, Oh, and I should add that it’s unlikely listeners will “get the chips datashet in say, blind testing between vintage JRC and new Fairchild. I liked the 3 listed above enough to ‘splurge’ and order about 15 of each. The old pedal was not superior to the new one in any way, in fact, it was inferior in ways. Conversion to TS – this seems to be a perennial hot one. In addition, the JRCD was used in tons of Japanese audio equipment at about the same time, so a junky cheap Japanese stereo or datashete radio could have several hidden inside it.


Robbie WMay 24, The Rat2 is the same way. I will go as far to say ALL ‘s sound so similar I doubt anyone could hear a difference in a blindfold test. By all reports, these sound as good as the original. May 23, 3. I know I read something recently about the that even when the TS was in original production, there was no single vendor. I don’t think we’ll see a pedal guru doing any sort of semi-scientific chip preference test any time soon though I think the high end stereo guys, in particular, have been suseptable to this sort of pseudo-scientific datasbeet.

I attribute the superior tone to the builder of the box. The TL has a lot higher input impedance extremely higher actually. It’s a little relieving to know datassheet some of the opamp chip gurus were willing to let this out of the bag.

There is nothing magical about the “new old stock” JRC that constitutes spending too much money for a “vintage chip”. I tested about 25 different chips back in ’99, in datzsheet few 9’s, a few 5’s, and a clone.