clintrubber said:
gyraf said:
CJ said:
try it with more power.
they might be slightly magnetized.
Good point. Is there anything to do to restore to original specs in such case?
Jakob E.
A nice coincidence, Jim G./ZapNSpark (IIRC it was him) just posted a link at the micbuilders-list
to a Studer-article about (de)magnetizing TXs: SwissSound18eFeb87LR.pdf
I'll post the link later; I only have the file here, but Google doesn't find it.
Demagnetizing Microphone Input Transformers ....lifted out of my Studer 963 manual;
Symptoms;
If magnetized, you might experience microphonic noise, e.g., tapping the input module without any input source connected, you will audible modulation.
Residual magnetiation can accumulate over extended operating time. Can be caused by connection of unbalanced sources or the shorting of the + and - leads when the 48V phantom supply is activated
Solution;
Switch off mixer/unit.
Connect audio generator as follows;
____ Resistor 50 ohms _____ + Cap 1000uF 10V -______________________
| | |
Generator Resistor 600 ohms Trans Primary
|______________________________________________|__________________|
Set Generator to 32Hz, 0V output, slowly increase the generator output from 0V to 3V
Slowly decrease the generator output from 3V to 0V
Demagnetization completed.
Cheers
Michael