Gachet
Well-known member
Hi;
I recently put my hands on some kind of schoeps CMT30F with cardiod capsule that works.
The capsule is in great shape but the preamp has a lot of hiss. It's manageable on loud sources but it's not on vocals and quiet accoustic instruments.
I think the preamp has been modified to accomodate +48 instead of -10.
NPN transistors have been replaced with PNP except for the FET.
the 5.6v zener along with the polarized caps are reversed.
My question is:
is that ok to replace polarized caps and transistors to reduce hiss?
What is common practice in that case?
I saw that cleaning the board was important regarding noise.
Thanks
I recently put my hands on some kind of schoeps CMT30F with cardiod capsule that works.
The capsule is in great shape but the preamp has a lot of hiss. It's manageable on loud sources but it's not on vocals and quiet accoustic instruments.
I think the preamp has been modified to accomodate +48 instead of -10.
NPN transistors have been replaced with PNP except for the FET.
the 5.6v zener along with the polarized caps are reversed.
My question is:
is that ok to replace polarized caps and transistors to reduce hiss?
What is common practice in that case?
I saw that cleaning the board was important regarding noise.
Thanks
