high gain lee jackson gp 1000
Moderators: pompeiisneaks, Colossal
Re: high gain lee jackson gp 1000
Ill bet your guitar is not grounded properly. Have done any work to it?
Re: high gain lee jackson gp 1000
just recently switched to lace pickups to try and combat the hum but it made no difference. ill take some pics. its possible i am missing something simple.
[img
1840]http://i.imgur.com/dXWHjwr.jpg[/img]
shows shielded cavity and cover. this guitar does have an actual battery holder but i moved it into the cavity to see if that changed anything. of course it didnt.
[img1840]http://i.imgur.com/UMwKYpC.jpg[/img]
sorry for all the long wires. just got this pickup to see if it would help with noise so i left wires long in case it didnt work i could return it.
[img1840]http://i.imgur.com/96o2XhH.jpg[/img]
wiring diagram from lace said to leave this wire unconnected for normal humbucker operation. i can swap this out to ground for split/single coil mode.
[img1840]http://i.imgur.com/G6Vmyht.jpg[/img]
lace white/black wire ground here. lace green wire grounds here. string ground grounds here. and esp mm04 grounds here. the other wire from mm04 labelled ground goes all the way to the output jack.
also i have checked and rechecked the shielding to make sure its all connected and grounded properly.
i lost the wiring diagram for the mm04 and never had a schematic but here is a schematic for the jackson je1000 which the mm04 was based on
[img:839:808]http://i.imgur.com/7UYk91d.jpg[/img]
and here is the diagram i got from lace
[img:729:863]http://i.imgur.com/VEjBeRw.jpg[/img]
[img
1840]http://i.imgur.com/dXWHjwr.jpg[/img]
shows shielded cavity and cover. this guitar does have an actual battery holder but i moved it into the cavity to see if that changed anything. of course it didnt.
[img
1840]http://i.imgur.com/UMwKYpC.jpg[/img]
sorry for all the long wires. just got this pickup to see if it would help with noise so i left wires long in case it didnt work i could return it.
[img
1840]http://i.imgur.com/96o2XhH.jpg[/img]
wiring diagram from lace said to leave this wire unconnected for normal humbucker operation. i can swap this out to ground for split/single coil mode.
[img
1840]http://i.imgur.com/G6Vmyht.jpg[/img]
lace white/black wire ground here. lace green wire grounds here. string ground grounds here. and esp mm04 grounds here. the other wire from mm04 labelled ground goes all the way to the output jack.
also i have checked and rechecked the shielding to make sure its all connected and grounded properly.
i lost the wiring diagram for the mm04 and never had a schematic but here is a schematic for the jackson je1000 which the mm04 was based on
[img:839:808]http://i.imgur.com/7UYk91d.jpg[/img]
and here is the diagram i got from lace
[img:729:863]http://i.imgur.com/VEjBeRw.jpg[/img]
Re: high gain lee jackson gp 1000
Oh crap its ACTIVE ! Could be your preamp.
Re: high gain lee jackson gp 1000
yeah. passive pickup with active on board gain boost/treble cut.billyz wrote:Oh crap its ACTIVE ! Could be your preamp.
Re: high gain lee jackson gp 1000
Bypass the active preamp and get back to us.
Re: high gain lee jackson gp 1000
i dont have an extra pot and the one in there is attached to the active pre. i could pull that off but risk messing up the pre's pcb....billyz wrote:Bypass the active preamp and get back to us.
i do have the switch hooked up so i can bypass the gain boost. with that deactivated the hum is a lot quieter but so is the guitar signal.
Re: high gain lee jackson gp 1000
I just have to ask, are the shielding, ground wires, and bridge connected to the ground portion of the 1/4 inch jack?
What?
Re: high gain lee jackson gp 1000
Okey, so I think I figured out the real issue of the noise on the GP-1000.
The signal goes way too close to the power section at several places. I moved some cables a few inches more away, and now there is no noise on the pot, however, it is still present underlying, however I've read that all amps have this. I tested this out on the original which have less of a mess cabes and untidy lead dressing, and so on. Now I tried putting a SD-1 overdrive pedal in front, and there is barely noise when pushed to maximum on all settings.
Does this give you a clue towards what measures could be done to prevent this from happening at all. You know cables could move back towards the power section and mess up the signal. Also there is lines going to the relay from the power section and this probably is/was what my Bodom tech was talking about that it kind of needs to be isolated by rewiring so it doesn't interfere. So amp geniouses, any good tips and no I won't hand anything to any tech just yet.
The signal goes way too close to the power section at several places. I moved some cables a few inches more away, and now there is no noise on the pot, however, it is still present underlying, however I've read that all amps have this. I tested this out on the original which have less of a mess cabes and untidy lead dressing, and so on. Now I tried putting a SD-1 overdrive pedal in front, and there is barely noise when pushed to maximum on all settings.
Does this give you a clue towards what measures could be done to prevent this from happening at all. You know cables could move back towards the power section and mess up the signal. Also there is lines going to the relay from the power section and this probably is/was what my Bodom tech was talking about that it kind of needs to be isolated by rewiring so it doesn't interfere. So amp geniouses, any good tips and no I won't hand anything to any tech just yet.
Re: high gain lee jackson gp 1000
I'm not a genius but I have been called a genie ass.
If I really wanted one of those, my solution would be to take the schematic and build from scratch using good build techniques.
If I really wanted one of those, my solution would be to take the schematic and build from scratch using good build techniques.
What?
Re: high gain lee jackson gp 1000
i took my preamp over to my mother in laws house out in the middle of nowhere. difference in hum was like night and day. there was still some hum if i really(really!!) listened for it but nothing like i was getting in my house.
so i guess only solutions would be a faraday cage room or a really nice noisegate. isp decimator is looking good but expensive!!!
so i guess only solutions would be a faraday cage room or a really nice noisegate. isp decimator is looking good but expensive!!!
Re: high gain lee jackson gp 1000
Are all the front pots grounded through the front-face of the chassis? I saw some old post by Carmeron I've seem to neglect/not notice.... Still have the noise on both units, but are shipping off the original 88 to the Finnish tech when he gets back to me about payment options and shipment. Clone does use other types of pots with dust caps except the midshift one, it is made of plastic and are as far as I'm concerned then not connected to ground at all (if the previous info is correct).
Gorhrut how did you add the midshift #3 value into the unit without adding the switch pot?
Gorhrut how did you add the midshift #3 value into the unit without adding the switch pot?
Re: high gain lee jackson gp 1000
on mine, i put a wire from each pot(that needed grounding) to the cathode of the stage it is in. the pot casings have no electrical connection with the rest of the circuit.Rune wrote:Are all the front pots grounded through the front-face of the chassis? I saw some old post by Carmeron I've seem to neglect/not notice.... Still have the noise on both units, but are shipping off the original 88 to the Finnish tech when he gets back to me about payment options and shipment. Clone does use other types of pots with dust caps except the midshift one, it is made of plastic and are as far as I'm concerned then not connected to ground at all (if the previous info is correct).
Gorhrut how did you add the midshift #3 value into the unit without adding the switch pot?
midshift is just a capacitor in parallel with the treble cap of the tone stack.
same as in original, it was just on a switch.
also, i placed an isp decimator in between the guitar and the preamp and it is dead silent. even when using a new guitar with factory installed pickups it hummed until i turned on the pedal. so either something is wrong with both guitars, or theyre just picking up emi.