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Hi ,
I picked up a faulty ART Dst-830 , mainly for the speaker box , but thought it might be possible to repair the amp. The preamp is has a 12ax7 running a low voltage , mixed with a cs4218 digital cmos to a 130watt Dan Pearce Designed poweramp.
The signal from the analog section of the preamp , ie from the fx send is ok with no faults . After that it it is distorted, static , low in volume. I placed a cable between the fx send and return and thought that i had fixed the issue was fixed but after awhile it happened again.Taping the case above the fx loop appears to stop it some times but less than half the time
The other thing is the whole case seems to buzz and hum quite alot, it in a way that doesn't sound right to me.
Anyway it might be the fx return jack , i could replace that ... it might be the fx pad -10 , or +4 db, it could be an issue with the cmos chip or the voltage to that part of the circuit, or perhaps a fault in the poweramp .
Where is the best place to start troubleshooting ?
Attached is the signal path that printed on the top of the rack.
The person i bought it off , had the schematics , but said he wasn't going to try to find all the dry joints,
If may be a dry joint but i suspect something else , at least can any one point me in the right direction?
I picked up a faulty ART Dst-830 , mainly for the speaker box , but thought it might be possible to repair the amp. The preamp is has a 12ax7 running a low voltage , mixed with a cs4218 digital cmos to a 130watt Dan Pearce Designed poweramp.
The signal from the analog section of the preamp , ie from the fx send is ok with no faults . After that it it is distorted, static , low in volume. I placed a cable between the fx send and return and thought that i had fixed the issue was fixed but after awhile it happened again.Taping the case above the fx loop appears to stop it some times but less than half the time
The other thing is the whole case seems to buzz and hum quite alot, it in a way that doesn't sound right to me.
Anyway it might be the fx return jack , i could replace that ... it might be the fx pad -10 , or +4 db, it could be an issue with the cmos chip or the voltage to that part of the circuit, or perhaps a fault in the poweramp .
Where is the best place to start troubleshooting ?
Attached is the signal path that printed on the top of the rack.
The person i bought it off , had the schematics , but said he wasn't going to try to find all the dry joints,
If may be a dry joint but i suspect something else , at least can any one point me in the right direction?
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