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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Definitely better than some of the garbage op amps that were used in the early TS9 reissues. Both have the JRC By all reports, the current manufacture JRCD’s sound just as good as the ones current with the manufacture of the original tube screamers. There are over 40 different dual op amp chips available.

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.

I tested datasheef 25 different chips back in ’99, in a few 9’s, a few 5’s, and a clone. And is anyone aware that the TS7 has the “correct” chip and output resistor values? You must log in or sign up to reply here. 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 think the high end stereo guys, in particular, have been suseptable to this sort of pseudo-scientific clap-trap.


What have y’all overheard at the musician’s watercooler discussions?

(PDF) jrc4558 Datasheet download

Your name or 45588 address: There are probably 3 that most guitarists would agree sound ‘bad. TL my fave The LT was also kinda cool sounding, but not consistently so in the handful of pedals that I tried it in.

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. May 24, 5.

No, create an account now. This is where the rec. I don’t think we’ll see a pedal guru doing any sort of semi-scientific chip preference test any time soon though Oh, and I should add that it’s unlikely listeners will “get the chips right” in say, blind testing between datashedt JRC and new Fairchild. I started researching TS’s quite a long time ago.

May 24, 6.

JRC4558 myths…

They are still available in isolated caches of parts, although they can sometimes be hard to find. Sorry to kick over any sacred cows but this is just my opinion based on my experience. I replaced the two output resistors with carbon film resistors I had laying around, and I just order a couple of new RCP’s for 25 cents a piece.


Great points made, truly. Personally, I think it’s the build of the pedal and the sum of all components.

Datasheett have another clone of the same circuit that I paid significantly less for and it shows. Conversion to TS – this seems to be a perennial hot one. The old pedal was not superior to the new one in any way, in fact, it was inferior in ways. I guess I’ll check back in 10 years from now and see how things have changed.

JRC Datasheet PDF – Dual Operational Amplifier

The differences between the TL and the are subtle, but there none the less. May 23, 4. I then went on to check the specs of each ‘good’ chip. Robbie WMay 24, It’s a little relieving to know that some of the opamp chip gurus were willing to let this out of the bag. May 24, 9. datashet

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. 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: