JRC4558DV

Some like 'em and some don't, but I bet everyone has at least a couple — Analog Delay, Digital Delay, Reverb, Chorus, Flanger, Phaser, Tube Overdrive, Transistor Overdrive, Fuzz, Octave Fuzz, Tremolo, Vibrato, Compressor and the list goes on!

JRC4558DV

Postby outlier on Thu Aug 26, 2004 4:19 pm

Can anyone tell me the difference between the JRC4558DV chip and the ordinary JRC4558D?
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Re: JRC4558DV

Postby psychodave on Thu Aug 26, 2004 7:24 pm

The only difference I can tell is the "V". ;)
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Re: JRC4558DV

Postby chrism on Thu Aug 26, 2004 7:54 pm

I doubt anyone except JRC (New Japan Radio Corporation IIRC), can say. First I would assume that all 4558D's are not all the same. I easily can imagine that the original equipment that they used in the 80s is so far obsolete that they have had to "reinvent" the chip to use current processes. And being lazy, they don't rename things. So, they could be identical, could be a binning method (low offset for instance), or it could be a completely different chip inside.

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Re: JRC4558DV

Postby outlier on Thu Aug 26, 2004 8:21 pm

It's an older circa-'80s chip with the glossy finish.

I was thinking of using it in an homemade Orange Squeezer project.
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Re: JRC4558DV

Postby Dai on Thu Aug 26, 2004 8:44 pm

I think it's just a low-noise version. For some reason, instead of just having one extra suffix to designate a low-noise version like they do today ("NJM4558DD", "NJM4558SD", etc.), there seem to be a number of the older ones w/multiple suffixes, such as "4558DA", "4558DE", "4558DM", etc. Why so darn many? I have no idea (maybe they spell out a secret code if you find them all).

Oh, and if anyone is interested, I have a single example of the rarest of the rare JRC4558 chip--a can package JRC4558T with GOLD-plated leads--guaranteed to turn you into SRV instantaneously from the moment you plug this chip into your Tube Screamer... YOURS FOR ONLY $50!!!! BARGAIN PRICE!!! BUY NOW!!! OPERATORS STANDING BY!!! RAJIV OR RENU WILL TAKE YOUR CALL NOW..(err...make that "John" and "Lisa"...) ;)
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Re: JRC4558DV

Postby outlier on Thu Oct 07, 2004 6:40 pm

OK, ended up putting a socket in one of my Maxon OD808s and experimented with different chips, among them, the Texas Instruments RC4558P (many original OD808s had this chip) as well as the JRC4558DV chip.

Tell you what: The JRC4558DV chip is very happening. Wish I could find some more of these. Very nice smooth but detailed overdrive, a little "richer" sounding than the ordinary JRC4558D chips. Single notes are airy and natural-sounding. No raggedness. With an overdriven amp, sounds really great. Smooth natural sustain that retains note attack.

Of course, that's as much to do with the circuit as anything else, but I never liked overdrive pedals that were too smooth and softly compressed. The JRC4558DV seems to let initial pick transients come through a little better.
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Re: JRC4558DV

Postby retrobob on Sun Oct 17, 2004 12:41 am

Actually one of my best tubescreamers didn't have the fables JRC4558 chip. Whats up with that??
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Re: JRC4558DV

Postby Dai on Sun Oct 17, 2004 5:07 am

which one? the Malaysia-made texas instruments? And what in the tone do you like about it can I ask (compared to other ones you've tried)? Thanks!
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Re: JRC4558DV

Postby outlier on Mon Oct 18, 2004 3:13 am

I've mentioned this here before: I have found the Texas Instruments RC4558P chip to be a little grittier and have more of a low mid tone. Straight away, I thought to myself, that's a part of the SRV tone right there.

Some may disagree. And there are certainly those that know the SRV tone better than I. But it's a good chip for those looking for something a little beefier.
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Re: JRC4558DV

Postby Dai on Mon Oct 18, 2004 10:22 am

thanks outlier, I guess that agrees w/my memory of trying my lone old Malaysia TI4558--sort of grittier than the JRC(or at least the JRC seemed smoother as I recall). I think I have at least one of the other-than- NJM(JRC)4558Ds that were used stock in the originals (2043DD, Toshiba 75558, Malaysia TI). Oh yeah, there was yet another JRC4558D+suffix I'd never heard of before--a 4558D"Y"--weirrrd.
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Re: JRC4558DV

Postby outlier on Mon Oct 18, 2004 1:54 pm

Yeah, give the RC4558P a shot. You might really like it. In my experience as well, the JRC chip is definitely smoother.

I stripped the RC4558Ps out of a pair of trashed MXR Flanger/Doublers, so they have the '70s mystical mojo thing going on for them. I'd sometimes thought of getting the RI TS808 and putting one of these chips in it for the ultimate in authenticity. :)

I also have a few JRC4558DD chips, but haven't tried them yet. But honestly, the DV chip is pretty cool. I don't think it's my imagination.
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Re: JRC4558DV

Postby Noel on Mon Oct 18, 2004 2:49 pm

I sent a Tube screamer and an '80s Metal Screamer to Robert Keeley 2 yrs ago to have him mod them. Had the TS-808 output filtering changes, his '2nd order harmonics' trick, which uses uneven clipping (changes one diode to a silicon diode). AND, to Keeley, the MOST important thing: the TI chip. They both had originally the JRC chip.
Obviously, several things were done to these pedals at once.
But, These pedals now have more lower-mid, LESS Bass, and tend to be a little darker (even though less bass), and produce more harmonics. In fact, with the tone at 12 o'clock, and the drive all the way up, you get what sounds like a very faint 2nd note on top of the fundamental. I assume that's the 2nd order harmonic. It's not a dissonant tone, but a very nice effect.
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Re: JRC4558DV

Postby outlier on Mon Oct 18, 2004 3:24 pm

There you go. That's my experience with the RC4558P chip, aside from the second harmonic clipping diode thing.

Metal Screamer: TOTAL sleeper pedal. Don't be put off by the name and the pink trim. You Blues guys have to hear this pedal. You'd love it.

The LM833 chip is nice too. I repaired one of those Way Huge OD pedals (is the name Swollen Pickle?) several years ago. Very nice tone, smooth, but "animated" overdrive for lack of a better term.
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Re: JRC4558DV

Postby FloPoeKo on Tue May 20, 2014 7:05 pm

outlier wrote:OK, ended up putting a socket in one of my Maxon OD808s and experimented with different chips, among them, the Texas Instruments RC4558P (many original OD808s had this chip) as well as the JRC4558DV chip.

Tell you what: The JRC4558DV chip is very happening. Wish I could find some more of these. Very nice smooth but detailed overdrive, a little "richer" sounding than the ordinary JRC4558D chips. Single notes are airy and natural-sounding. No raggedness. With an overdriven amp, sounds really great. Smooth natural sustain that retains note attack.

Of course, that's as much to do with the circuit as anything else, but I never liked overdrive pedals that were too smooth and softly compressed. The JRC4558DV seems to let initial pick transients come through a little better.


Outlier, can you tell some more about your experiences with the 4558DV. Is it still in production under this code or discontinued? Are you still fond of that opamp in Ts-like-pedals?
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Re: JRC4558DV

Postby Roy Boltz on Tue May 27, 2014 4:53 pm

Since this is about the 4558 type chip I am wondering if anyone has experience with the ones the have Italy on them?
I have one in my Ross Distortion & I really like this pedal.
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