both pres are noisy now

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both pres are noisy now

Postby rjrockandrollmachine » Sun Dec 21, 2008 1:21 pm

so recently i built 2 c84s and they were working great. recently i went to use them and noticed when using dynamics or a ribbon the noise floor is really loud. i was wondering if anyone had a solution for this? the gain when using condensers is really hot. typically i can't turn the pre up at all and it is still overloading things.

any thoughts would be awesome!

-rick
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Postby tpryan » Sun Dec 21, 2008 2:29 pm

What revision of the board do you have?
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Postby rjrockandrollmachine » Sun Dec 21, 2008 4:14 pm

i bought them in october so it should be the rev 1.9 boards.

-rick
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Postby tpryan » Sun Dec 21, 2008 6:06 pm

Has this symptom just appeared, or have you just recently noticed it?

What sort of recorder or interface are the preamps connected to?

Are you absolutely certain that you're driving a line level input set to +4dBu and not a mic level input?

Does the noise disappear if you short pin 2 to pin 3 at the input XLR?
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