Persiflage
Head-Fier
- Joined
- Jul 24, 2001
- Posts
- 74
- Likes
- 0
So I've spent a number of hours trying to figure out the problem with my META42, but I've come up with nothing; I don't even know what the problem might be.
I bought a used META off someone a while back, but the on/off switch was damaged in shipping. I jury-rigged a quick fix while at college and lived with it. After I got home at the end of the semester, I took out the old switch and put in a new one.
Problem is, I must have hit something else while changing the switch. I can now hear a soft hum at all times. When I touch the case, the hum gets louder. If I touch the outside metal part (ground?) on either of the RCA jacks, the hum goes away. The amp still plays music correctly, no matter what I am touching.
It's in one of those nice aluminum Hammond cases. When I take it apart, and the main chassis and the back plate (where the RCA jacks, switch, and power-in are) are no longer touching, I can touch the back plate without causing the hiss.
If I touch the outside casing (the plastic part) of the wires leading from the PCB to the pot the hiss increases for the particular channel who's wire I touched.
I figure that I bumped something, and that two things that should be touching aren't, or that two things that shouldn't be touching are. I've tried playing with it to figure out what's wrong, but I haven't had any success yet. I have no idea what to look for, I'm mostly just stumbling around. I was wondering if anyone more knowledable than I might be able to give me some hints or a little advice. Any help would be appreciated.
Thanks,
Alex
I bought a used META off someone a while back, but the on/off switch was damaged in shipping. I jury-rigged a quick fix while at college and lived with it. After I got home at the end of the semester, I took out the old switch and put in a new one.
Problem is, I must have hit something else while changing the switch. I can now hear a soft hum at all times. When I touch the case, the hum gets louder. If I touch the outside metal part (ground?) on either of the RCA jacks, the hum goes away. The amp still plays music correctly, no matter what I am touching.
It's in one of those nice aluminum Hammond cases. When I take it apart, and the main chassis and the back plate (where the RCA jacks, switch, and power-in are) are no longer touching, I can touch the back plate without causing the hiss.
If I touch the outside casing (the plastic part) of the wires leading from the PCB to the pot the hiss increases for the particular channel who's wire I touched.
I figure that I bumped something, and that two things that should be touching aren't, or that two things that shouldn't be touching are. I've tried playing with it to figure out what's wrong, but I haven't had any success yet. I have no idea what to look for, I'm mostly just stumbling around. I was wondering if anyone more knowledable than I might be able to give me some hints or a little advice. Any help would be appreciated.
Thanks,
Alex