livingtree
New member
I purchased a mid-1980s M-320 mixer a few months ago for cheap and really like the sound. However, when it warms up after an hour it lets in noise which is most likely of the 60 hertz variety. It hums louder when the AC switches on or I futz with my light dimmer. But like I said, I have zero issues until about an hour after it's been on.
So I began my quest of figuring out what the problem could be. I recapped the power section, the output section, and the 4 channel buss section. The only things not recapped are the 20 input channels and the VU meters. I did, however, change out the lights in the meters and they all work now, however one is dimmer than the others.
The weird thing is if I go direct out from any of the input channels' own output (essentially bypassing the main outs and busses) I get no hum , even hours after being on.
I've tried multiple outlets in multiple rooms and unplugged virtually all that I can that I thought could be causing the outside noise.
Next up is recapping the VU meters and hope that that miraculously solves the issue, but I'm skeptical.
My other worry is that it could be the power transformer. I wouldn't mind swapping that out, but I have no idea how to match it. My electronic knowledge basically boils down to I can replace components fairly well. In fact, I've built my own clone pedals and even a JTM-45 amp clone, but if you ask me how things work, i'd be at a lost most times. I'm a "paint by the numbers guy", I guess.
So my question is: Could it be the power transformer? And if so, how do I find the right replacement? The only Identifying marks are: Teac QL76-504N C55. The Tascam Manual for the M300 series identifies it as: 5320033100
Any help would be great! Thanks, guys
So I began my quest of figuring out what the problem could be. I recapped the power section, the output section, and the 4 channel buss section. The only things not recapped are the 20 input channels and the VU meters. I did, however, change out the lights in the meters and they all work now, however one is dimmer than the others.
The weird thing is if I go direct out from any of the input channels' own output (essentially bypassing the main outs and busses) I get no hum , even hours after being on.
I've tried multiple outlets in multiple rooms and unplugged virtually all that I can that I thought could be causing the outside noise.
Next up is recapping the VU meters and hope that that miraculously solves the issue, but I'm skeptical.
My other worry is that it could be the power transformer. I wouldn't mind swapping that out, but I have no idea how to match it. My electronic knowledge basically boils down to I can replace components fairly well. In fact, I've built my own clone pedals and even a JTM-45 amp clone, but if you ask me how things work, i'd be at a lost most times. I'm a "paint by the numbers guy", I guess.
So my question is: Could it be the power transformer? And if so, how do I find the right replacement? The only Identifying marks are: Teac QL76-504N C55. The Tascam Manual for the M300 series identifies it as: 5320033100
Any help would be great! Thanks, guys