Hi there,

I've just recently built myself an MP573 and it has been working fine for about two weeks. For the last 1-2 days the sound level kept changing at the start but stabilized short after that (like 2-3 mins). But since after I pulled out the module and reinstalled it I have constant low volume and close to no low end.

I've searched for other topics to "no low end" and therefore checked the Input transformer resistance on the 2/3 pin of the XLR and my values are in the kOhms - way to high for the expected 48 ohms that should be expected afaik. At the same time I noticed, that one of the PCB-connection pads seems to be pretty damaged. Could this be the reason? If so is this repairable or have I damaged it beyond repair?

VTB9045 is at:
2-4: 23,3 ohm
3-5: 23,3 ohm
7-9: 130 ohm
8-10: 130 ohm

VTB1845
yellow-orange: 6,4 ohm
red-brown: 5,2 ohm
green-blue: 19,8 ohm
violet-black: 19,8 ohm

Would have measured the dc voltages aswell but the referred image of the post https://www.soundskulptor.com/forum/index.php?topic=5.0 is missing.

Again - it worked for 2 weeks flawlessly and sounded awesome. the only thing i redid was the solders to from the vtb1845 wires to the little connector board since my solder job wasn't that good.

Best,
Thomas