Okay, decided that I could test it with a 33k grid stopper, have some around from my unused JE-1000 clones. Or could run two in series, but would increase the chances of shorts, and I've read that 33k could be enough to prevent noise even on high gain. Also read that low gain amps that have good input ground would'nt really need it, but yeah, since the noise appears when I roll the master volume, distortion and treble up I fligure it is needed.
Unable to do this tonight since I'm away from my amp, but will let you guys know the result tomorrow.
Gorhrut, you connected both V3a and V3b to one master? There might be some issues with the components if you used the same as on one of two masters. I'm thinking that the unconnected noise is the issue and the feedback is just volume related? or?
high gain lee jackson gp 1000
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Re: high gain lee jackson gp 1000
no only v3b is used. v3a has no heater connection and no signal connections.
im thinking the noise/feedback issues are emi related because with the guitar unplugged the amp is noise free. i just ordered a lace deathbucker pickup because its advertised as noise free and they say it cancels out 60hz noise. hopefully this is the solution. still have to figure out whats up with the master volume tho.....
im thinking the noise/feedback issues are emi related because with the guitar unplugged the amp is noise free. i just ordered a lace deathbucker pickup because its advertised as noise free and they say it cancels out 60hz noise. hopefully this is the solution. still have to figure out whats up with the master volume tho.....
Re: high gain lee jackson gp 1000
You have a ground issue somewhere.....so does Rune.Gorhrut wrote:no only v3b is used. v3a has no heater connection and no signal connections.
im thinking the noise/feedback issues are emi related because with the guitar unplugged the amp is noise free. i just ordered a lace deathbucker pickup because its advertised as noise free and they say it cancels out 60hz noise. hopefully this is the solution. still have to figure out whats up with the master volume tho.....
Re: high gain lee jackson gp 1000
Cameron wrote:You have a ground issue somewhere.....so does Rune.Gorhrut wrote:no only v3b is used. v3a has no heater connection and no signal connections.
im thinking the noise/feedback issues are emi related because with the guitar unplugged the amp is noise free. i just ordered a lace deathbucker pickup because its advertised as noise free and they say it cancels out 60hz noise. hopefully this is the solution. still have to figure out whats up with the master volume tho.....
thats causing the master volume issue? how do i test/what do i look for to fix this?
Re: high gain lee jackson gp 1000
So you think it is a ground issue when the grid stopper isn't there at all and it is eliminated with low master volume or treble also distortion tames it. Would have to be related to V1 then or input....
Also Gorhrut had it eliminated in his original state amp and have now a very simple grouding solution that seems bullet proof at least with sheilded cable...
Also Gorhrut had it eliminated in his original state amp and have now a very simple grouding solution that seems bullet proof at least with sheilded cable...
Re: high gain lee jackson gp 1000
Check your grounds..... make sure its not a ground loop ....try moving the ground of the master. Could be a layout issue too. Does it change if you put your finger in the ground of the master?Gorhrut wrote:Cameron wrote:You have a ground issue somewhere.....so does Rune.Gorhrut wrote:no only v3b is used. v3a has no heater connection and no signal connections.
im thinking the noise/feedback issues are emi related because with the guitar unplugged the amp is noise free. i just ordered a lace deathbucker pickup because its advertised as noise free and they say it cancels out 60hz noise. hopefully this is the solution. still have to figure out whats up with the master volume tho.....
thats causing the master volume issue? how do i test/what do i look for to fix this?
Re: high gain lee jackson gp 1000
Your grid stopper may be on the tube socket. Grounds are a funny thing ...You just have the same problem as the original pre .......its layout...and its the last stage....but I cant see it so its very hard to tell you where or what to do. You need to take it to a good tech ...it would take little time for him to fix your problem.Rune wrote:So you think it is a ground issue when the grid stopper isn't there at all and it is eliminated with low master volume or treble also distortion tames it. Would have to be related to V1 then or input....
Also Gorhrut had it eliminated in his original state amp and have now a very simple grouding solution that seems bullet proof at least with sheilded cable...
Re: high gain lee jackson gp 1000
It is not on my tube socket, checked 4 times, no resistor there at all except the two ground resistors (R201/R202). No grid stopper at all. On the last stage...Gorhrut fixed it without touching much of the last stage.... Did the exact same thing as him... And no this is not going to a tech, if I can't fix it. I throw the pcb in the bin and get a new improved one from the maker.
Re: high gain lee jackson gp 1000
ill give it a try. i think im going to remove what was the internal trimmer also. i use it on full anyways.Cameron wrote:Check your grounds..... make sure its not a ground loop ....try moving the ground of the master. Could be a layout issue too. Does it change if you put your finger in the ground of the master?
update: removed the gain pot and problem is solved. dont know if it was the ground or the pot itself but either way its fixed.
now to try the lace deathbuckers to fix the 60hz......
Re: high gain lee jackson gp 1000
Dude ...it would take five min to fix if its in front of someone....You do not know enough about this stuff.....why waste that preamp ...I don't get it!!???...good luck..Rune wrote:It is not on my tube socket, checked 4 times, no resistor there at all except the two ground resistors (R201/R202). No grid stopper at all. On the last stage...Gorhrut fixed it without touching much of the last stage.... Did the exact same thing as him... And no this is not going to a tech, if I can't fix it. I throw the pcb in the bin and get a new improved one from the maker.
Re: high gain lee jackson gp 1000
Cool. It sounds good with SD blackouts I have in my V. Im not a fan of active pickups but I like these.Gorhrut wrote:ill give it a try. i think im going to remove what was the internal trimmer also. i use it on full anyways.Cameron wrote:Check your grounds..... make sure its not a ground loop ....try moving the ground of the master. Could be a layout issue too. Does it change if you put your finger in the ground of the master?
update: removed the gain pot and problem is solved. dont know if it was the ground or the pot itself but either way its fixed.
now to try the lace deathbuckers to fix the 60hz......
Re: high gain lee jackson gp 1000
idk why but the blackouts never really did it for me....
i enjoy the sterility of EMGs. im weird as hell tho...lol. the lace pickups are supposed to be even more sterile and flatter eq. said to be a "hi-fi" type sound, so it should showcase the nuances of this preamp circuit.
i enjoy the sterility of EMGs. im weird as hell tho...lol. the lace pickups are supposed to be even more sterile and flatter eq. said to be a "hi-fi" type sound, so it should showcase the nuances of this preamp circuit.
Re: high gain lee jackson gp 1000
No won't take it to a tech for several reasons;
1. It is no guitar techs or guys at the instrument stores with knowleadge for about 60 metric miles.
2. In Norway that kind of stuff is very very expensive. Even minor stuff. Like $2-300.
3. It is my signature amp with my name on it, built by a friend in Slovakia. He could figure it out and has the instruments and knowleadge how to, but he dosen't have the time and not as much interest anymore. But he promised to remake pcb(s).
Anyways havent got to soldering the input grid stopper yet, very cold in Norway and I'm only able to work at my rehersal, which is barley warm enough to keep instruments and amps operational right now. So will do it later if I can. Checked out the amp , seems like the C4/trimpot is/was soldered to the wrong spot, it is a bit weird because of the second EQ. But it is supposed to be between the masters and not in the EQ circuit I think.
1. It is no guitar techs or guys at the instrument stores with knowleadge for about 60 metric miles.
2. In Norway that kind of stuff is very very expensive. Even minor stuff. Like $2-300.
3. It is my signature amp with my name on it, built by a friend in Slovakia. He could figure it out and has the instruments and knowleadge how to, but he dosen't have the time and not as much interest anymore. But he promised to remake pcb(s).
Anyways havent got to soldering the input grid stopper yet, very cold in Norway and I'm only able to work at my rehersal, which is barley warm enough to keep instruments and amps operational right now. So will do it later if I can. Checked out the amp , seems like the C4/trimpot is/was soldered to the wrong spot, it is a bit weird because of the second EQ. But it is supposed to be between the masters and not in the EQ circuit I think.
Re: high gain lee jackson gp 1000
So I've tried installing a grid stopper and rewiring C4 between the two masters instead at 2 EQ switch, and nothing got better or worse. Still same old story. There must be some issue with the overall design... and yes possiby a ground issue. It is like the signal is partly being fed to ground, thats what it sounds like...the little signal that comes through gets all buzzed.
I guess I'll wait for a new PCB which I'm promised....and hope he'll figure it out with a oscilloscope and testing...
I guess I'll wait for a new PCB which I'm promised....and hope he'll figure it out with a oscilloscope and testing...
Re: high gain lee jackson gp 1000
no luck for me either....the "noiseless" pickup helped a total 0%...
because of this im thinking its an issues with the mm04 booster having all unshielded wires. i have the control cavity shielded but then the wires have to run through the pickup cavity and then all the way up to the upper horn of the jackson rr24 to get to the jack. maybe im picking up emi after the pickup?
do you think shielding the entire inside of the guitar will have an effect? maybe i could wrap wire runs with aluminum foil and ground it? im really at a loss for what to do. the buzz/hum makes me not want to play at all, and definitely not make vids for youtube.
the wires for the battery also run right next to the wires for the output jack. could this be part of the issue?
because of this im thinking its an issues with the mm04 booster having all unshielded wires. i have the control cavity shielded but then the wires have to run through the pickup cavity and then all the way up to the upper horn of the jackson rr24 to get to the jack. maybe im picking up emi after the pickup?
do you think shielding the entire inside of the guitar will have an effect? maybe i could wrap wire runs with aluminum foil and ground it? im really at a loss for what to do. the buzz/hum makes me not want to play at all, and definitely not make vids for youtube.
the wires for the battery also run right next to the wires for the output jack. could this be part of the issue?