DIY Pultec EQP-1A (RecPro Build) weird RF noise OPT

[andYz00m]

Hey there, have a pair of pultecs I built using the kit and layout from Ron at RecPro audio. They have been stalwart every day go to but I just started noticing some noise on one of the units at super low level and dug in. The noise changes pitch depending on where the primary wires of the OPT are moved inside the chassis. Never had an issue like this.

Video attached. This is the Cinemag peerless clone CM-S217D

 

[andYz00m]

Solved. Was a grounding issue with the interface front end. Unit is fine. Crazy $hit though.