benacquier
Member
Hello Everyone,
I'm quite new to the forum and diy audio. I've built some kits, and try to learn electronics through readings and practice, all regarding audio mixing. I've already found many helpful threads in this forum, and would like to get some help about a subject which is not yet developped in the forum, but I might have missed it.
I have a TL Audio FatTrack for quite a long time, and just went through a big cleaning, trying to find what generate problems in the audio path, pulling off all the cards, looking for some visual evidences of failure, but after reassemble the unit still produces most of the issues:
- some pots are noisy when turned, less than before the cards cleaning with non-residue alcohol, but still. Should I try to change a couple of pots to begin with? Change also the electrolytic capacitors? they look fine, but after 15 years of service... maybe something else?
- the 4 stereo channels labelled A, B, C and D have another issue, none of them is correctly left/right balannced. I ran a 1Khz tone @ +4dBu, and get a 5 to 7 dB difference between each Left/ Right channels, on the digital meters. Quite unuseable for summing. Is there a calibration procedure? Could the components from each channel be faulty?
- the tube stage calibration might need a check, but I can't find any procedure about that. One of the photos shows 4 calibration sockets on the tubes pcb?
That's a lot to ask, I know
Any help would be greatly appreciated.
Thank you
Ben
I'm quite new to the forum and diy audio. I've built some kits, and try to learn electronics through readings and practice, all regarding audio mixing. I've already found many helpful threads in this forum, and would like to get some help about a subject which is not yet developped in the forum, but I might have missed it.
I have a TL Audio FatTrack for quite a long time, and just went through a big cleaning, trying to find what generate problems in the audio path, pulling off all the cards, looking for some visual evidences of failure, but after reassemble the unit still produces most of the issues:
- some pots are noisy when turned, less than before the cards cleaning with non-residue alcohol, but still. Should I try to change a couple of pots to begin with? Change also the electrolytic capacitors? they look fine, but after 15 years of service... maybe something else?
- the 4 stereo channels labelled A, B, C and D have another issue, none of them is correctly left/right balannced. I ran a 1Khz tone @ +4dBu, and get a 5 to 7 dB difference between each Left/ Right channels, on the digital meters. Quite unuseable for summing. Is there a calibration procedure? Could the components from each channel be faulty?
- the tube stage calibration might need a check, but I can't find any procedure about that. One of the photos shows 4 calibration sockets on the tubes pcb?
That's a lot to ask, I know
Any help would be greatly appreciated.
Thank you
Ben