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Build help and troubleshooting => MP573 Microphone preamplifier => Topic started by: sdiazmun on April 20, 2026, 08:07:07 PM

Title: Second hand MP573 with -6dB level drop
Post by: sdiazmun on April 20, 2026, 08:07:07 PM

Hi!!

Im just received a second hand MP573 (I have other three), and after compare them with "Smaart", the last one has a -6dB drop across the entire frequency spectrum, and that difference remains even when modifying the gain or the output potentiometer.

Where should I start looking for the point of failure?

Thanks in advance
Regards 
Sergio

Title: Re: Second hand MP573 with -6dB level drop
Post by: JPK on April 21, 2026, 09:59:19 AM

Is the 6dB drop the same for a gain set to 20dB and a gain set to 30dB ?

Title: Re: Second hand MP573 with -6dB level drop
Post by: sdiazmun on April 21, 2026, 10:16:03 AM

Yes, at all gain and output positions

Title: Re: Second hand MP573 with -6dB level drop
Post by: JPK on April 21, 2026, 11:29:51 AM

Perform the checks described here, starting by Try to follow the signal:
https://www.soundskulptor.com/forum/index.php?topic=5.msg5#msg5

Report any difference.