Hey,
A couple of months ago I have bought an Soundtracs Topaz 32x8x2 with meterbridge. After a while the mixer started to give that irritating hum around 100hz. That peak is -40db so it always present in softer music passages.
I've recapped partially the powersupply and it improved but still that hum comes in randomly. When the peak leds (under the fader) are having a peak the hum will sound or will go away. That peak will lit a half second on all the channels, all the same way. When the unit is fully warmed-up the hum is away but still there is some fase in the sound. I see that fase in an analyzer and you can hear it. I'm thinking that the caps has never been replaced so I have ordered five new capacitors for the powersupply.
With the meterbridge it has a peak on all the channels (LED on the meterbridge) when turning on the powersupply. Didn't have that before replacing the worn-out caps inside the mixer. The orignals were 50v and I have replaced them with 63v, no problem right?
And by the way I cannot measure the powersupply. Atleast, not the capacitors. The connector will pop-out when the top of the mixer is lift. It's a very short cable that connects with the mixer itself, too bad.
Many, many thanks if somebody can help me with this! :grin:
A couple of months ago I have bought an Soundtracs Topaz 32x8x2 with meterbridge. After a while the mixer started to give that irritating hum around 100hz. That peak is -40db so it always present in softer music passages.
I've recapped partially the powersupply and it improved but still that hum comes in randomly. When the peak leds (under the fader) are having a peak the hum will sound or will go away. That peak will lit a half second on all the channels, all the same way. When the unit is fully warmed-up the hum is away but still there is some fase in the sound. I see that fase in an analyzer and you can hear it. I'm thinking that the caps has never been replaced so I have ordered five new capacitors for the powersupply.
With the meterbridge it has a peak on all the channels (LED on the meterbridge) when turning on the powersupply. Didn't have that before replacing the worn-out caps inside the mixer. The orignals were 50v and I have replaced them with 63v, no problem right?
And by the way I cannot measure the powersupply. Atleast, not the capacitors. The connector will pop-out when the top of the mixer is lift. It's a very short cable that connects with the mixer itself, too bad.
Many, many thanks if somebody can help me with this! :grin: