soundchaser59
Reluctant Commander
Anybody here who might know what to suggest?
I think I accidentally applied phantom power to the XLR output of my PAIA tube mic preamp. Does anybody know what parts are most likely to have been damaged by this??
The output has a few resistors and a couple of 33uf / 16v caps, but also an IC chip. I assume the caps and the IC are the most vulnerable to damage of this nature??
Otherwise the input and the lights and tube drive and everything appear to be working fine, I just get a signal out that is next to nothing. I've already eliminated the tube and external factors. Please keep in mind that I do not have an o'scope, I only have a VOM. I do have an identical TMP that is working correctly to compare it to, if someone can tell me what I might check and compare.
Any suggestions?
PS: Attached a schematic. The output XLR jack "Bal Out" is on the right. I assume that caps C21 and C22 rated at 16v each would have been or could have been fried by the 48v phantom power. I also assume that the caps would not allow the dc power to pass thru to the IC3 chip, so I'm hoping the IC is ok and it is only the caps that got damaged.
I think I accidentally applied phantom power to the XLR output of my PAIA tube mic preamp. Does anybody know what parts are most likely to have been damaged by this??
The output has a few resistors and a couple of 33uf / 16v caps, but also an IC chip. I assume the caps and the IC are the most vulnerable to damage of this nature??
Otherwise the input and the lights and tube drive and everything appear to be working fine, I just get a signal out that is next to nothing. I've already eliminated the tube and external factors. Please keep in mind that I do not have an o'scope, I only have a VOM. I do have an identical TMP that is working correctly to compare it to, if someone can tell me what I might check and compare.
Any suggestions?
PS: Attached a schematic. The output XLR jack "Bal Out" is on the right. I assume that caps C21 and C22 rated at 16v each would have been or could have been fried by the 48v phantom power. I also assume that the caps would not allow the dc power to pass thru to the IC3 chip, so I'm hoping the IC is ok and it is only the caps that got damaged.