Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: slash1986 on July 29, 2018, 11:30:14 am
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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. (http://bee.mif.pg.gda.pl/ciasteczkowypotwor/SM_scena/Inne/jet-city_jca20h_sch.pdf)
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.
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Is this on a PCB board? What speaker are you using?
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take the part of yours I highlighted and make it look more like the example
blending V1 make's it better than Marshall did :icon_biggrin:
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 :dontknow:
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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.
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take the part of yours I highlighted and make it look more like the example
blending V1 make's it better than Marshall did :icon_biggrin:
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 :dontknow:
jcm800 style.
Yours is definitely good advice. :w2:
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Yours is definitely good advice.
I wouldn't go that far :icon_biggrin:
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
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What could happen if I did this:
could I use another valve a new input and bypass the first valve in the circuit?