Ibanez - TS-9DX Turbo Tube Screamer [schematic]

[modman]

Try as I might, I could NOT find a schematic on the internet. Service manual is available, but it does not detail the operation of the "MODE" switch, and does not provide a schematic. So, I traced it.

Finally! I schematic detailing the inner workings of the elusive TS9DX, and associated modes. All in all, its a Tube Screamer. Surprised? There are some unique qualities to the TS9DX, and some of the modes may surprise you.

Without further ado, here is the schematic. Now the internet has a reference. Enjoy!

(Updated schematic below)

[bajaman]

I think there should be a link wire between the mode switch sw1a and sw1b common terminals
bajaman
ps: thanks

[Jack Deville]

Right on all accounts. Sorry guys. I got lazy and forgetful.

I'll make corrections, add the bypass circuitry and additional notes specifying opamp and any other pertinent information.

As far as the dual-ganged 250k pot, WTF? It works, right? Maybe it was readily available and/or cheaper than a 500k? I thought it was a little strange/unusual as well.

Updates to follow.

PS: bajaman, I don't follow your suggestion. Can you expand? SW1A selects clipping diode options (or lack thereof in the "TURBO" mode) while SW1B selects feedback loop bypass cap. Did I mis-understand you, or make and error?

[Dirk_Hendrik]

error
There should still be a connection from those caps to the inverting input of the opamp. Check a standard TS schem for reference and see how they've added the switch and you'll see what Baja means.

[modman]

Updated.

If any further errors are present, please advise. I will correct them and add bypass circuit.

[stonew]

cool

[TubeDude22]

Very interesting. Thanks!

[jumper]

thank

[okgb]

Just different networks switched into the fb loop ,
anyone seen the schematic [ and/or what analogman does ]
As simple as two wires going going to the switch ?
thanks , regards Greg

[collingtech]

yes i had this...somewhere in my hds (3 x500gb) il post soon , what mod you loocking for? drive?tone?

[JHS]

Just a stock TS with switchable Cs on the R/C-network and switchable FB-loop clippers.

Stock TS9DX:

the 4.7k R is unchanged in all modes

TS9-mode: 0.047nF+2 Si-diodes
+mode: 0.22nF +4 Si-diodes
hot-mode: 1.0nF+2 red LED+470kin parallel with the LEDs
(I'm, not sure about this, 'cos I've seen a DX with 4 Si-diodes in this mode and no 470k)
Turbo-mode: 2.2uF+none diodes



Analog Man TS9DX:
classic and silver mod on request and mode-mod

TS9-mode: 0.047nF+2 Si-diodes
+mode: 0.1nF+4 Si-diodes
hot-mode: 0.1nF+3 Si-diodes
Turbo-mode: 0,22nF+3 Si-diodes

The keeley mod is similar. You can find info about his mod on the web. Use google.


JHS

[Jack Deville]

I can't believe I'm saying this:
Use the search function.

After searching and searching, I could not find a schematic of this pedal. So I traced it.
viewtopic.php?f=1&t=8179

Bypass is omitted. Its the standard Ibanez flip-flop circuit.
Enjoy!

[roseblood11]

What sense does that dual gang drive pot make? Wouldn´t a simple 500k pot give the same results?

[Jack Deville]

Yes, roseblood. It would perform the same function.
It struck me as odd when I saw it, but that's what's in there. Maybe they had a huge stock-pile of dual ganged pots, or maybe they were super cheap or maybe.... you get the idea.
Who knows. Works the same.

[okgb]

Thank you , was mostly curious about how they implimented the switching
but nice job on the schematic [ and now new internet reference ]
i would have paid for that .
what program did you use to make the schematic btw ?

[Jack Deville]

Never pay for schematics!
Glad I could contribute to the stockpile of information we all have available to us. I have benefitted greatly from said information. Proud to finally give back in my meager way.

The schematic was created using Express Schematic.
It is available for FREE here:
http://www.expresspcb.com/ExpressPCBHtm ... ftware.htm

[Dirk_Hendrik]

Never pay for schematics!

uuh..
I sometimes do.
When paying a few bucks saves me hours of tracing for example. Or when I get the real service manual including setup procedures.

[Jack Deville]

caveat:

If you can possibly avoid it

Most stuff I come across is readily available, with a few exceptions. Those are the bummers. This schematic eliminates one of em.

[mookie]

I hope you don't mind me posting this question here but I was hoping someone may be able to help. I'm currently repairing a turbo tube screamer that's taken a kick on stage and damaged the drive pot. I've spent a good coupe of hours now searching manufacturer and parts site for a replacement and I'm not having any luck. The alps web site doesn't even list a 250k pot in any of the dual gang versions I can find. Has anyone got any ideas as to where I might be able to get on. Or failing that a 500k that I can use in it's place.

Thanks for your time and all the great schematics

[Jack Deville]

http://www.mouser.com/ProductDetail/Alp ... ioJOdsA%3d

??

I don't remember the model used. Just a shot in the dark.