More safety earthing issues. VOX AC30 and Yamaha PA

A couple of safety earthing issues I’ve seen over the last few weeks.

Here’s the safety earth from a recent repair on a JMI era VOX AC30.

Suffice to say, if you were going to solder the safety earth to something, then the chassis might have been a better bet……

AC30 earth

OK, that was a vintage amp with questionable earth bonding. Here’s the safety earth bond from a new Yamaha PA that had failed the PAT earth bond test.

The manufacturer had relied on the star washer piercing the powder coat on the chassis to give a good bond to earth.

Earth powder coat

The powder coat should have been masked off the power coating so there was bare metal under the earth bond to ensue a low earth resistance.

I scraped off the power coat before re-attaching the earth bond, and the amp passed the earth bond test.


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