Do you have a SX-50 still ?
I am wondering as we will have to identify some transistors (FET's) as they don't seem to be marked on the schematic.
Q21 and Q22 are most likely JFET's in a TO-92 casing so we need to identify them.
The LED's D1, D3 and D5 are most likely red, but best to make sure, they should be on the PCB as well.

Quote from: Tassieviking on December 01, 2023, 12:42:31 PMWould you be able to check the reverb tank for the model ?
I might build myself one of these and the reverb tank information is not on the schematic.
If you could provide all information you can see on the tank I should be able to work it out.
Thanks
Mick

Hey Mick,

Be glad to. I'll pull her apart tomorrow and send you some pics/info. It is an Accutronics brand just like Fender uses. That much I know of off hand.

Quote from: g1 on December 04, 2023, 12:32:28 PM

Quote from: Tassieviking on December 03, 2023, 10:17:37 PMhttps://carvinaudio.com/pages/guitar-amp-schematics

Excellent.  From the SX package on that page, the SX50 is pg.14 and 15 of the pdf.

Quote from: smsuryan on December 03, 2023, 08:50:50 PMnot sure how to distinguish where the "blues button" is located and omit the clean channel. 

The blues button puts back the 500Hz that is notched out for metal and hard rock tones.  It is only on ch.1.
It is shown as S1A and S1B around IC's A3A and A8A.
Around Vol.3 pot (which should be labelled Vol.2?) you can see the 500HZ notch circuit with no defeat switch.

Wow! Thanks for your help! I'll check that out!

Quote from: Tassieviking on December 03, 2023, 10:17:37 PMhttps://carvinaudio.com/pages/guitar-amp-schematics

Excellent.  From the SX package on that page, the SX50 is pg.14 and 15 of the pdf.

Quote from: smsuryan on December 03, 2023, 08:50:50 PMnot sure how to distinguish where the "blues button" is located and omit the clean channel. 

The blues button puts back the 500Hz that is notched out for metal and hard rock tones.  It is only on ch.1.
It is shown as S1A and S1B around IC's A3A and A8A.
Around Vol.3 pot (which should be labelled Vol.2?) you can see the 500HZ notch circuit with no defeat switch.

Quote from: Tassieviking on December 03, 2023, 10:17:37 PMI was looking at the schematics as well and we really need to know what model we are talking about, there are differences between the different size amps.
We might also need help identifying some of the components as they might not be marked the schematic.
I was pleasantly surprised when I found  the schematics on Carvins website.
https://carvinaudio.com/pages/guitar-amp-schematics

It's the sx50 model..the smallest one.  Might not be much different than the 100 model?

I was looking at the schematics as well and we really need to know what model we are talking about, there are differences between the different size amps.
We might also need help identifying some of the components as they might not be marked the schematic.
I was pleasantly surprised when I found  the schematics on Carvins website.
https://carvinaudio.com/pages/guitar-amp-schematics

Quote from: phatt on December 03, 2023, 05:31:48 PMCan I suggest you mention the model and maybe a link to Schematic might help.
If you have the Amp open, take some gut shot pics of the internals would be helpful.
Phil.  

https://cdn.shopify.com/s/files/1/0476/5297/files/sx-schematics-all.pdf?2270

It's a lot to sift through, not sure how to distinguish where the "blues button" is located and omit the clean channel.  It's been awhile since I've read one of these.  Haven't opened up the amp yet. 

Can I suggest you mention the model and maybe a link to Schematic might help.
If you have the Amp open, take some gut shot pics of the internals would be helpful.
Phil.  

 I've owned 2 solid-state carvin sx amps, the overdrive sounds great turned to 7 or 8 with the blues switch turned on.  The clean channel I don't really use too much. I would like to make a similar amp with one channel and lessen the overdrive to that "sweet spot". I used to have a job soldering circuit boards for a living years earlier. I think it would be a fun and challenging project.  I'm sure there's a lot to learn, I've looked at the several schematics for that amp and it's just pages and pages so I'm not sure which one (or more) to reference.  I don't want to launch the space shuttle, just make a decent one channel amp (head), and a solid state is even more satisfying since most amps are tube.  Any advice, references, etc.  I'd appreciate.  I'm not in a giant hurry or anything.  I'd like to do this slowly, carefully, and accurately. 

Would you be able to check the reverb tank for the model ?
I might build myself one of these and the reverb tank information is not on the schematic.
If you could provide all information you can see on the tank I should be able to work it out.
Thanks
Mick