Uni-Vibe - Grounding mains cable to chassis?

[clarisso11]

Just finished putting this together, earth securely connected to the chassis. Works great, no hum or other noise issues!

[Jquijano]

Nicy!

[Chuck H]

That looks like crap!

[The Dude]

FWIW (and I'm not trying to be a critical ass): Make sure you have a good ground connection there. I'd be slightly worried that the painted chassis is preventing a good ground. If you haven't, I'd scrape off some of the paint under that ground screw/transformer mount. It's also recommended that you use a separate bolt/chassis connection for ground and not a transformer mounting bolt. That said, I do see manufacturers use transformer bolts for ground quite often. At any rate, at least make sure the ground is good and not obstructed by paint.

[Chuck H]

I'd be slightly worried that the painted chassis is preventing a good ground. If you haven't, I'd scrape off some of the paint under that ground screw/transformer mount.

clarisso11 actually did acknowledge the non conductive painted chassis in the opening post. Still, this is a good observation of the circumstances. The pic certainly doesn't look to have any scratchy marks near or around any boltings.

[SoulFetish]

Also, a shared transformer bolt is probably the worst place to worst place to ground a piece of equipment. All transformers vibrate due to magnetostriction; some more than others. If there's a DC component on the mains line, it will be even worse. Not trying to be overly critical. The wiring looks great otherwise. But best practices would have the earth connection get a designated nut and bolt that is not shared with any other connection.

[clarisso11]

Thanks all for the input, I've just installed a dedicated ground connection, paint scraped off!