Hi I have had this problem for a while now, since 2009, and I really want to get to the point where it's gone so that I can use my instruments in the away they were designed to be used?..with the PSU.
I would really appreciate some knowledgeable help on this I've been through it before with my series guitar and thought it was down to my amp because the noise went away for a while but alas not for long so I got frustrated by it and basically gave up just tried to live with the problem and as a result have only used the guitar at home apart from 2 outings.,
Now I have a major gig in just under a months time at the Symphony hall in Birmingham for one of the Olympic Games parties that is happening here. Both the Jamaican and USA teams are going to be based here and in the city so begin a high profile gig I really want to take my Series II bass to it. But this problem is going too make it difficult for me to take it.
With Series II bass or series I guitar the situation is exactly the same so I doubt if it is a problem with the instruments as that would indicate a design fault which I very much doubt.
Right.
I have two PSU's one which came with my Series I guitar and one that came with the series II bass. The only one that works is the one that came with the Series I guitar. The one that came with the series bass, I changed the voltage selector to 240v and plugged in and it gave some signal for a few seconds then stopped and has not worked ever since. It's now on the pile of objects to take for electronic repair or bin depending on my mood at the time. :-(
I have two rigs. One with F1-x, SF2, QSC amp and mesa cabs, the other is a Mesa walkabout head and mesa cabs. and again the situation is exactly the same on both rigs and guitar rigs, Fender Twin and Roland JC120.
Anyway here is the situation when using the remaining working PSU.
(1) When I plug in the series cable into the PSU and and take a signal from any output on it into my rig.
Result: Great bass sound but on top of that there is high frequency hiss, ( like frying breakfast).
Not mains hum.
(2) Now if I remove the series cable from the bass and the psu, and plug a standard jack cable from the bass into either rig using battery power only for the bass.
Result: No Noise just great bass sound.
(3) Plug the series cable into the bass and leave the other end free and disconnected using the battery to power the bass and standard jack connected between bass and rig.
Result: Great bass sound no noise.
(4) Plug the series cable into the bass and PSU to power the bass, remove the audio jack cable from PSU, plug standard jack connected between bass and rig.
Result: Great bass sound and noise.
(5)Plug the series cable into the bass and PSU, turn off mains power to psu and unplug mains connector, plug audio cable from PSU to rig.
Result: No bass sound only noise.
(6)Plug the series cable into the bass and PSU, turn off mains power to psu and unplug mains connector, a standard jack connected to rig from bass.
Result: Great bass sound and noise.
(7) plug standard jack cable into rig without connection to anything else
Result: No Bass sound (obviously) but Mains Hum, NO high frequency hiss as described above..
(
Remove Series Cable from bass and PSU, and remove Standard Jack cable from bass and bass rig.
Result: No bass sound, No Noise. :-)
As I said earlier, I tried the above scenario's on both bass and guitar and they are exactly the same.
I cannot begin to describe how annoying this is???.
Jazzyvee
