Question on Chassis Ground

[Hammond63]

In my setup, audio ground is connected to earth at the chassis

As I noted above, it's really a moot point whether or not my own audio equipment is earth-grounded because the house I live in (which I rent -- I'm not the owner) has no earth-grounded outlets in the room where my main system is located.
But if I were building something, then, yes, I would earth-ground the chassis.

"Death cap" is pretty standard terminology in the musical instrument amplifier world for capacitors wired from one side of the AC power input (or sometimes both sides) to chassis ground, intended prevent the chassis from becoming a radio antenna. If you haven't heard it, then you must not be acquainted with that side of the audio world.

 

[kodabmx]

Oh, I've heard of it, but I've heard about the mushrooms a lot more often 😀
I had a Sansui amp that I could feel the leakage current through the front panel from one of those caps...
I ground my metal chassis for reasons mentioned here such as not wanting current running through RCA cables in the case of a fault...

 

[Laney]

No. Should return to first filter cap.

Same point in my build.

 

[Laney]

Thank you all for the detailed responses. I put in a simple jumper from the star point to a terminal strip ground lug so my signal ground is now connected to chassis. If I get any undesirables, I'll go back in and change this to a resistor or the diode bridge option. I'm so glad I asked! It just didn't 'feel' right to me when I realized I had no continuity between sig and chassis grounds. Now I'm off to build the box!

 

[Chris Hornbeck]

You had the foresight to think about signal "ground" as an important element of building an amplifier, so you have options. It wasn't that many years ago when most folks just believed the schematic and bolted signal "grounds" to chassis where convenient. And usually wired the AC primary circuit to Class 0 (no PE, no double insulation). Been there.

All good fortune on your new build,
Chris