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Build help and troubleshooting => EQ573 Equaliser => Topic started by: distortionplus on November 13, 2025, 03:37:45 PM

Title: First three frequencies on the mid band not working
Post by: distortionplus on November 13, 2025, 03:37:45 PM

Hi,

I bought a pair of earlier 573s on Reverb, not fully working. I've ironed out many of the issues with relative ease but just come down to one last problem that I thought might be good to get some help on.

It's an EQ573-REV1.4

The first three frequencies on the mid band do nothing - the signal is unaffected by boost/cut, the EQ starts working as you would expect at 0.7 onwards.

0.27, 0.36 & 0.5 selections do nothing.

Any clues?

Thanks so much, the EQs sound really good and I'm looking forward to hopefully having them working 100%!  

Title: Re: First three frequencies on the mid band not working
Post by: JPK on November 13, 2025, 04:55:25 PM

Check the solder joints of inductor L1, in particular the bottom left pad, near R35.

Title: Re: First three frequencies on the mid band not working
Post by: distortionplus on November 13, 2025, 06:34:54 PM

On it - thank you!

Title: Re: First three frequencies on the mid band not working
Post by: distortionplus on November 13, 2025, 07:08:32 PM

Quote from: JPK on November 13, 2025, 04:55:25 PM

Check the solder joints of inductor L1, in particular the bottom left pad, near R35.

Fixed!!!!! Thank you so much for the fast response and very helpful advice!

Title: Re: First three frequencies on the mid band not working
Post by: JPK on November 14, 2025, 05:13:29 PM

(https://fonts.gstatic.com/s/e/notoemoji/16.0/1f44d/32.png)