Modification Of a Guitar Amplifier Circuit.

[slash1986]

Hello everyone, I'm here because I need your help.
I have this guitar amp: jetcity JCA20H.


This is the link to the machine diagram.




I would like to modify the circuit a little, to get the sound and distortion typical of marshall amplifiers.
Do you have any advice?


Thanks so much.

[tubenit]

Is this on a PCB board?   What speaker are you using?

[shooter]

take the part of yours I highlighted and make it look more like the example

blending V1 make's it better than Marshall did 

you already have a DCCCF driving the TS
the bigger ? what marshall type, can you buy a broke one and fix it instead of breaking a good amp you can't fix 

[slash1986]

Is this on a PCB board?   What speaker are you using?

Yes is on PCB. I use a Celestion Vintage 30. When i record the Amp i use a reactive load box with impulses.

[slash1986]

take the part of yours I highlighted and make it look more like the example

blending V1 make's it better than Marshall did 

you already have a DCCCF driving the TS
the bigger ? what marshall type, can you buy a broke one and fix it instead of breaking a good amp you can't fix 

jcm800 style.


Yours is definitely good advice. 

[shooter]

Yours is definitely good advice.

I wouldn't go that far 
after 21 "builds" 5 of which are commercial-ish, doing the mixing with V1, driving, or recovering the TS with a DCC,CF has impressed the guys with guitars the most.

that said, basterdizing a pcb can and WILL cause you greif, but if you take your time and can solder well, maybe even use "add-on" pcb chips, it's very doable

[slash1986]

What could happen if I did this:


could I use another valve a new input and bypass the first valve in the circuit?