Bottlehead Kits > Mainline
Need some help fixing a faint hum
Paul Birkeland:
Perhaps it wouldn't hurt to post some build photos.
MikeSattler:
Okay thank you for looking! Here's a Google photos album with the build: https://photos.app.goo.gl/oEUx4thV1rVWwXZh6
The underside of the chassis got a bit of overspray from the powdercoating. However, I sanded off the powdercoat in all the spots where it looked like a chassis ground connection was made. Other than the obvious ground lugs and lugs 3 and 7 on the attenuator is there anything else to make sure has a proper ground?
Paul Birkeland:
What's the DC resistance between the "E" terminal on the IEC power entry module and the bare metal of the plate holding the attenuator switches up front?
MikeSattler:
Getting 37.4 kohm
Paul Birkeland:
The paint on the bottom side of the plate is causing issues. I've circled some points that need to be scraped on the bottom side of the plate to establish proper earthing. I would scrape a few of the holes around the standoffs for the front attenuator plate just to be extra sure that grabs earth nicely.
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