Ibanez - JD-9 Jet Driver  [schematic]

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.
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Cloud10
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Post by Cloud10 »

Looks strikingly similar to the old Super Tube in features and has the dual JRC4558. Not sure about the specifics though. Anyone want to take a more educated guess?
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Post by Greenmachine »

Enter Dirk Hendrik in 3 ... 2 ... 1 ... :popcorn:
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Post by Greg »

According to a Premier Guitar review:
"The Mid control is the most obvious—and welcome—addition to what you’d consider a standard TS circuit."
culturejam wrote: We are equal opportunity exposure artists.

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Post by Dirk_Hendrik »

Greenmachine wrote:Enter Dirk Hendrik in 3 ... 2 ... 1 ... :popcorn:
Sorry. Different timezones. I had to wake up first :mrgreen:

Thanks for the pics. First time I see one so I cannot say that much, other than that the first thing to check was wether one of the pots was a dual. In that case chances would be good we were looking at a resurrected Super Tube. But that does not seem to be the case.
Sorry. Plain out of planes.

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Post by jonny4rd »

The blank space in the middle of the 4 knobs is begging for a switch or another pot. I'm thinking of adding bass boost with a capacitor on a mini toggle across the 0047uf cap (in the OP's picture it's the silver cap in the middle of the board above IC on the right). Will that work?

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Post by Dirk_Hendrik »

Huh!?
You can tell the function of a cap from a photo without being able to see how it's connected? :shock:
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Post by analogguru »

Dirk_Hendrik wrote:Huh!?
You can tell the function of a cap from a photo without being able to see how it's connected? :shock:
Of course: the described capacitor is part of the "MID"-control. But I can´t tell you how a change of the value should influence the bass-response. BTW, the capacitor isn´t .0047µF, it is .047µF.
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.

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Post by jimpajohn »

Here's some more gut shots. I tried to make it easy. I can provide values if someone can draw up a schematic.

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Post by Dirk_Hendrik »

Thanks! :thumbsup
Drawing that schem will not be that much a problem. However, knowing the external wiring to the pots would come handy.
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Post by Dirk_Hendrik »

to be continued,
What is under that blob of white rubber glue on the solder side?
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Post by tube-exorcist »

Dirk_Hendrik wrote:to be continued,
What is under that blob of white rubber glue on the solder side?
green solder stop and then a ground plane (made from copper), then some glue and pertinax.
"I've noticed there's an inverse relationship between cost of gear and talent. If you need the most expensive gear to get decent tones, then you suck as a player."

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Post by Dirk_Hendrik »

Consider that question obsolete.

The more helpful answwer would be "a resistor". I had to revert to the JD9 to check for sure.
Sorry. Plain out of planes.

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Post by tube-exorcist »

Dirk_Hendrik wrote:Consider that question obsolete.

The more helpful answwer would be "a resistor". I had to revert to the JD9 to check for sure.
Do you expect from me that I should lie ? I mean, what can I do - there is simply no resistor (at least in my unit):
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Ibanez_JD9_tracks.jpg
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Post by Dirk_Hendrik »

And there has been another time where a certain Tube-Exorcist or his alter ego was absolutely sure he was right while there happened to be a post production mod later. Someting with an Ibanez Noise Buster if I remember correct. It took him a lot of effort even to admit that 2 parties could both be right.

Meanwhile, while drawing up a circuit diagram, intended to be posted here, I use the information I get provided by my forum members. That means I cannot revert back to "my suddenly appeared personal" unit. I do not have any. That also means I have trouble with suddenly appearing (partial) pictures to prove a case but nothing else.

We've been through this discussion before. I bail out. I have no interest in such a discussion anymore.
Sorry. Plain out of planes.

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Post by tube-exorcist »

Oh BTW - may be helpful - this jack is wired to the footswitch. So if there should be a resistor, maybe someoane added a pulldown resistor or so.
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Post by tube-exorcist »

component side:
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Post by tube-exorcist »

Oh and before I forget it, here are the potentiometer connections:
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Post by Dirk_Hendrik »

Pulldown....
And in your unit RLED is replaced by a jumper wire as well? Guess not.
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Post by Dirk_Hendrik »

tube-exorcist wrote:Oh and before I forget it, here are the potentiometer connections:
Thanks for the values. I had the connections already.

Standard hi, gyrator mid tone control.
Sorry. Plain out of planes.

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Post by tube-exorcist »

Dirk_Hendrik wrote:Pulldown....
And in your unit RLED is replaced by a jumper wire as well? Guess not.
I didn´t trace that part yet, therefore I don´t know. But looking at the pictures now it appears to me, that the "resistor" (jumper ?) is from LED-kathode to ground - obviously to induce a small current in the off-state to avoid popping... same effect as what wil be cured by a pulldown.....
"I've noticed there's an inverse relationship between cost of gear and talent. If you need the most expensive gear to get decent tones, then you suck as a player."

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