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DIY Stompboxes => Building your own stompbox => Topic started by: O on September 17, 2004, 12:15:35 PM

Title: Boss TR-2 Tremolo - Got Mods?
Post by: O on September 17, 2004, 12:15:35 PM
I want to introduce myself before I start asking for help. My name is Oscar and I'm a Network Security geek but I also play guitar and fondle guitar pedals in my spare time. I'm handy with a soldering iron and my most recent "build" was a TS that someone used a fork to change chips. I got it all fixed up and it sounds really good (I modded the pedal back to TS-808).

Formalities aside, I wanted to ask this. For father's day (soon to be anyway), my wife gave me a Boss TR-2 tremolo pedal. Now, I know that this pedal has potential (and surprisingly, the Dano Tuna Melt actually sounds better IMO). I experience a huge amount of volume drop when I engage it. Are there any mods that I could do to fix this? I can somewhat read a schematic, so anything like that (or in diagram form, or heck, even pictures) would help. I'm in a bind because I don't want her to know that I modded it (she would probably be upset) so I can't add a gazillion pots and switches to it, I need it to look stock.

OT, I noticed that people were wanting a CS-3 schematic... I just picked up a pedal on eBay and I would be willing to post pics for the real gurus out there to diagram it.

Thanks y'all... :D
Title: Boss TR-2 Tremolo - Got Mods?
Post by: cd on September 17, 2004, 12:37:43 PM
The CS3 issue was cracked a few days ago, scroll down for the schem.

As for the TR2, that nut has never been cracked before (I don't think a schem circulates) so if you can post big clear pictures of the top and bottom of the PCB - excellent!
Title: Boss TR-2 Tremolo - Got Mods?
Post by: O on September 17, 2004, 12:45:16 PM
Hmm... ok, I'll take some pics of the TR2 and post them. So I assume since the TR2 hasn't been messed with, there aren't as many mods out there?  :?
Title: Boss TR-2 Tremolo - Got Mods?
Post by: gez on September 17, 2004, 12:48:58 PM
If it's just volume drop then it's probably a trivial matter to correct it.  But, as has been pointed out, without a schematic (or pics and people willing to do the work of reverse engineering it) it's difficult to offer advice.  

Maybe someone here has one and you might get lucky...
Title: Boss TR-2 Tremolo - Got Mods?
Post by: MartyMart on September 17, 2004, 01:16:43 PM
Here's a TR-2 mod to recover some volume and other goodies :

Change R9 from 10k to 4.7k or even 3.3k for more vol
C7 remove for a slight "high end" lift
R31 is 50k and controls the speed of the trem, lower it to go faster baby!
R19 is 10k, reducing this changes the waveform, so be careful ! but its a fun thing to try.
I think the input resistor ( R2 ?) is 1m, but if its lower like a lot of Boss pedals such as 470k or 510k  just up the value to 680k or so for better signal through the circuit, even when bypassed.
Hope that helps, let me know.
Marty. 8)
Title: Boss TR-2 Tremolo - Got Mods?
Post by: O on September 17, 2004, 01:20:48 PM
Holy Moses!  :shock:

I can't wait to get home to ty that... Thanks Marty!
Title: Boss TR-2 Tremolo - Got Mods?
Post by: MartyMart on September 17, 2004, 01:30:53 PM
O, be very very careful, as its sooo easy to "burn" Boss circuit boards and destroy a very nice pedal !
Make sure that you get the iron nice and warmed up and dont spend too long on any solder pad, they have a habit of "lifting off" if they get too hot.
You have been warned !!
Its happened to me twice and i've modded about 50 pedals so far.
Enjoy,
Marty. 8)
Title: Boss TR-2 Tremolo - Got Mods?
Post by: O on September 17, 2004, 01:42:03 PM
I have a 30w iron that I use to mod the guitars/pedals I own. I've got the solder wick and the rest of the necessary materials, so hopefully, it will go smoother than having to make wire jumpers for the yanked JRC chip in the TS-9.
Title: Boss TR-2 Tremolo - Got Mods?
Post by: brrt on September 18, 2004, 09:14:30 AM
I've got a schematic of the TR-2. PM me if you like to have me email it to you!
Stinkfoot (http://www.stinkfoot.se/english/mods/tr2mod_en.htm) has modded the TR-2 by tweaking R9 and removing C7, just like Marty said...

Brrt
Title: Boss TR-2 Tremolo - Got Mods?
Post by: wampcat1 on September 20, 2004, 09:10:38 AM
Quote from: MartyMart
Here's a TR-2 mod to recover some volume and other goodies :

Change R9 from 10k to 4.7k or even 3.3k for more vol
C7 remove for a slight "high end" lift
R31 is 50k and controls the speed of the trem, lower it to go faster baby!
R19 is 10k, reducing this changes the waveform, so be careful ! but its a fun thing to try.
I think the input resistor ( R2 ?) is 1m, but if its lower like a lot of Boss pedals such as 470k or 510k  just up the value to 680k or so for better signal through the circuit, even when bypassed.
Hope that helps, let me know.
Marty. 8)


Funny -- that is the EXACT modification that I have on my diy kits at http://www.guitartone.net/  :roll:  :roll:  :roll:  :roll:  :x

 -- Please do not post those anywhere.
Title: Boss TR-2 Tremolo - Got Mods?
Post by: cd on September 20, 2004, 09:51:22 AM
Why isn't your username indyguitarist.com?
Title: Boss TR-2 Tremolo - Got Mods?
Post by: MartyMart on September 20, 2004, 10:07:24 AM
Wampcat1 wrote:

"Funny -- that is the EXACT modification that I have on my diy kits at http://www.guitartone.net/      
 Please do not post those anywhere". :?

Details for hundreds of mods for Boss/Ibanez/MXR  etc etc, are on the net and sometimes even posted up by kind folks like Robert Keeley,  thats a well documented one,  go have a look........ oh sorry but you already did that    !!!   :D

Marty.
Title: Boss TR-2 Tremolo - Got Mods?
Post by: wampcat1 on September 20, 2004, 10:07:44 AM
Quote from: cd
Why isn't your username indyguitarist.com?

Well, before I started my business, I posted on the old diystompboxes forum as wampcat, so I just kept my old name! :D
Title: Boss TR-2 Tremolo - Got Mods?
Post by: wampcat1 on September 20, 2004, 10:15:21 AM
Quote from: MartyMart
Wampcat1 wrote:

"Funny -- that is the EXACT modification that I have on my diy kits at http://www.guitartone.net/      
 Please do not post those anywhere". :?

Details for hundreds of mods for Boss/Ibanez/MXR  etc etc, are on the net and sometimes even posted up by kind folks like Robert Keeley,  thats a well documented one,  go have a look........ oh sorry but you already did that    !!!   :D

Marty.


Yep, that's true, and that's their business. I would prefer NOT to have my mods posted, however. If you would like free mods then simply send an email to info@guitartone.net and you'll be immediately emailed a link to the members area, which has some of my mods, and a free ebook on how to get the best tone out of your effects -- with suggested settings and such.

Thanks,
Brian
Title: Boss TR-2 Tremolo - Got Mods?
Post by: MartyMart on September 20, 2004, 10:51:05 AM
OK cool, my appologies wampcat, i did'nt realize that was your mod  i dont have any guitartone.com mods that i'm aware of.

Regards,
Marty.
Title: Boss TR-2 Tremolo - Got Mods?
Post by: wampcat1 on September 20, 2004, 11:08:01 AM
Quote from: MartyMart
OK cool, my appologies wampcat, i did'nt realize that was your mod  i dont have any guitartone.com mods that i'm aware of.

Regards,
Marty.


Not a problem, Marty -- check your pm ;)

Thanks,
Brian
Title: Ok, as promised...
Post by: O on September 23, 2004, 12:13:59 AM
I took some pics and they are here (http://webpages.charter.net/oscarv77/TR2/)

If more people can mirror them, I would appreciate it since the bandwidth is limited on my account. I'll start working on a parts list, it should be posted here by this weekend.

If there is a certain pic/angle/part you need photographed, just let me know.

Have fun! :)
Title: Boss TR-2 Tremolo - Got Mods?
Post by: MartyMart on September 23, 2004, 03:18:23 AM
O, how did the mod go ?
I seem to have got in "trouble" over it as its very close to wampcats mod, which he sells as part of a "kit"  so keep it quiet !!
I'm going to work on a version with a "dual concentric" pot to offer a volume control as well as speed.
Let me know how it sounds.
By the way if anyone is interested, the "Dan Electro Tuna Melt" tremolo is a great little unit, and V cheap  it does'nt seem to have a volume loss problem, so the LFO must be cycling above "normal" output volume.
Regards,
Marty. 8)
Title: Boss TR-2 Tremolo - Got Mods?
Post by: wampcat1 on September 23, 2004, 09:27:15 AM
Quote from: MartyMart
O, how did the mod go ?
I seem to have got in "trouble" over it as its very close to wampcats mod, which he sells as part of a "kit"  so keep it quiet !!
I'm going to work on a version with a "dual concentric" pot to offer a volume control as well as speed.
Let me know how it sounds.
By the way if anyone is interested, the "Dan Electro Tuna Melt" tremolo is a great little unit, and V cheap  it does'nt seem to have a volume loss problem, so the LFO must be cycling above "normal" output volume.
Regards,
Marty. 8)


Hi Marty - honestly, I apologize if I offended you -- I shouldn't have assumed it was mine. You have to admit though, it was nearly identical, wasn't it?! Did you check out the link for the diy kit I sent you?

Thanks,
Brian
Title: Boss TR-2 Tremolo - Got Mods?
Post by: MartyMart on September 23, 2004, 10:10:35 AM
No problem  8)

Since it was almost exactly the same, there was no need to download it !!

I'm still trying to improve things a little more, i've noticed a drop in high end too, which i can't solve right now, cap "tweaking" i think !!
Marty.
Title: Boss TR-2 Tremolo - Got Mods?
Post by: O on September 23, 2004, 03:10:31 PM
Quote from: MartyMart
O, how did the mod go ?


I haven't had a chance to work on the pedal... but since I already had it opened, I labeled the resistors that need tweaked.

I should have it done before Saturday, so I'll post here once I do...

-Oscar
Title: Boss TR-2 Tremolo - Got Mods?
Post by: dubs on September 30, 2004, 10:30:52 AM
o.k here's a schematic some one sent to me. Any thoughts to improve top end eq?
(http://img.photobucket.com/albums/v179/dubschan/TR2.jpg)
[/img]
Title: Boss TR-2 Tremolo - Got Mods?
Post by: mikeb on September 30, 2004, 08:31:36 PM
Quote from: MartyMart

Details for hundreds of mods for Boss/Ibanez/MXR  etc etc, are on the net and sometimes even posted up by kind folks like Robert Keeley


Where? Likely these are the ones he ripped off Analogman, Frank Clarke or others anyway. :roll:

Thanks for that schematic, dubs. Aside from impedance mis-matching (shouldn't be a problem with the FET buffer though) the only thing that jumps out is the removal of the 10pf cap that has already been mentioned.

Mike
Title: Re: Ok, as promised...
Post by: mrsage on October 26, 2004, 01:16:45 PM
Quote from: O
I took some pics and they are here (http://webpages.charter.net/oscarv77/TR2/)

If more people can mirror them, I would appreciate it since the bandwidth is limited on my account. I'll start working on a parts list, it should be posted here by this weekend.

If there is a certain pic/angle/part you need photographed, just let me know.

Have fun! :)
Are the pics gone now?

Can we get them back?

:D :D
Title: Re: Ok, as promised...
Post by: O on October 26, 2004, 01:29:10 PM
Quote from: mrsage
Are the pics gone now?

Can we get them back?

:D :D



Sorry, I have limited space I can use, so I had to take them down. PM me your email and I'll send them to you.
Title: Boss TR-2 Tremolo - Got Mods?
Post by: jimbob on October 26, 2004, 09:23:48 PM
It has to suck that any info out there about mods can be easily obtained by anyone--at least for those trying to make a business effort from it. But Im really not suprised at the same time cause it takes a certain kind of person to want to do these mods themselves. Keeley lists his-and why not? His modded pedals with his label on them add to the resell value on the net/ebay--same w Analogman..WIthout a popular name like that it seems to hender sales a bit..from what ive noticed. But..I think anyone in a forum like this and a drive to search the net will find these mods or someone who is willing to offer the info. I wish i had a business in Mod info--just not in these times when info is so quicky and easily obtained. I say goodluck to wampcat1- Its just a matter of time before your info becomes common knowledge. I really think those who buy from Keeley and Analog man are those who cant do it themselves--that and ive heard great quality/compliments from both. BUt if your a DIY''er-whats the point? Youll eventually get that info--if not better/updated/newer info rfom places like this...

Bla Bla bla--just makes me think really..This as a business just seems insane to me..But also the greatest hobby as well!
Title: Re: Ok, as promised...
Post by: mrsage on November 10, 2004, 03:15:13 PM
Quote from: O
Quote from: mrsage
Are the pics gone now?

Can we get them back?

:D :D



Sorry, I have limited space I can use, so I had to take them down. PM me your email and I'll send them to you.


Bump...did you get a chance to send them?
Title: Re: Boss TR-2 Tremolo - Got Mods?
Post by: knealebrown on April 23, 2010, 05:41:57 PM
Hey guys sorry to reeeeeeeeeeeeeeeealy dig this up lol. Its been a few years since i took out my c4 cap in the tr-2 to sort the volume drop out but having found this topic i got cracking trying some of the mods suggested. however after removing C7 for a 'slight "high end" lift' i seem to be picking up RF. is this a common problem? and why does this happen?

Title: Re: Boss TR-2 Tremolo - Got Mods?
Post by: Dreverb on July 08, 2018, 02:41:07 AM
Hello, I would love to know any mod   for the TR2.. nobody?
Title: Re: Boss TR-2 Tremolo - Got Mods?
Post by: lewsidiusmaximus on March 11, 2021, 10:07:38 PM
Does anyone know the Keeley mod and how that is done with the double knob on the depth?

Boss makes a great Tremolo pedal, the TR-2. We have more than solved the volume drop "problem," we've upgraded the audio circuitry and improved the response. We also have reduced unwanted distortions and noise. Now the pedal can even be used as a clean boost! The Keeley Electronics TR-2 modification gives you a blend between the stock look and the boutique look. Using Boss parts we have redesigned the depth control area to have a volume control as well! Now you have final control in the output level! This means you can stomp on the pedal for a nice volume boost during solos and drive your amp into a really cool, retro sound, or set it for an even volume level. By using a dual concentric potentiometer, the appearance is kept clean while making the pedal a useful tool for guitar players, keyboard players, etc. The Keys Man for the Goo Goo Dolls has already sent his in! We improve the bass response of the pedal. We upgrade the entire audio path for higher fidelity, which leads to more of your natural guitar tone getting through. You will now have more transparency and more highs.