Hello,
I just finished putting a G9 together. Then I powered up for the first time, the tubes heat up, the light comes on and everything seems to work. But when I hook up a microphone and turn up the gain and output, the output seems to work reverse turning and when I turn up gain beyond 5 or so I hear a horrible high squealing noise. Other than that there is only a (very faint) signal coming through. I already checked about the output pot wiring, that should be ok.
Now I suspect that maybe I made a mistake hooking up the two 10-pin wiring connectors from the main pcb to the control pcb´s.
On the schematic the main pcb connector says (from right to left) : To Outamp / Trafo - / Trafo + / Out - / Out + and so on ..
On the control pcb is written (from right to left): To Outamp / OUT - /OUT + /Trafo - /Trafo + / and so on ...
So the Trafo -+ and the Out -+ should be twisted? But I just wasn´t sure about this and hooked them up straight. So can it be that I made the big mistake there? I´d like to ask before I take it all apart again, as I said I was really not sure about this when I put it together.
Once I get it working and my knobs arrive I will post pictures soon.
thanks for any help,
reggie
I just finished putting a G9 together. Then I powered up for the first time, the tubes heat up, the light comes on and everything seems to work. But when I hook up a microphone and turn up the gain and output, the output seems to work reverse turning and when I turn up gain beyond 5 or so I hear a horrible high squealing noise. Other than that there is only a (very faint) signal coming through. I already checked about the output pot wiring, that should be ok.
Now I suspect that maybe I made a mistake hooking up the two 10-pin wiring connectors from the main pcb to the control pcb´s.
On the schematic the main pcb connector says (from right to left) : To Outamp / Trafo - / Trafo + / Out - / Out + and so on ..
On the control pcb is written (from right to left): To Outamp / OUT - /OUT + /Trafo - /Trafo + / and so on ...
So the Trafo -+ and the Out -+ should be twisted? But I just wasn´t sure about this and hooked them up straight. So can it be that I made the big mistake there? I´d like to ask before I take it all apart again, as I said I was really not sure about this when I put it together.
Once I get it working and my knobs arrive I will post pictures soon.
thanks for any help,
reggie