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Nice one, yeah this guy sort of said stop being a baby about getting electrocuted, it doesn’t really need an earth. What you say about earthing the case via the RCAs makes sense in a ‘you don’t want a seatbelt, you’re better off being thrown clear’ kind of way.
I use a Pro-ject Pre-Box DS2 digital. It has phono, analogue, Bluetooth and all the other digital ins, I use an Airport Express for Wi-Fi streaming.
user136479-
I'm going in circles looking at pre-amps. I want something that looks clean and utilitarian to match the Quad, has Bluetooth or Wi-Fi streaming in, has no other inputs so the front is uncluttered, RCA output...
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Nice one, yeah this guy sort of said stop being a baby about getting electrocuted, it doesn’t really need an earth. What you say about earthing the case via the RCAs makes sense in a ‘you don’t want a seatbelt, you’re better off being thrown clear’ kind of way.
Missed this. That's not very good advice. The reason being if something comes loose in the circuit and touches the case, at best it's going to put 240V AC down the RCA cables and either blow them apart or trip your house RCDs; at worst it'll put 360V DC on the case and I don't think the RCD will see it because it's not a direct connection between LNE. It'll just kill you instantly when you touch it.
I would strongly recommend you swap that two-pin power cable for a 3-pin IEC socket with filtered earth and a direct earth connection to the case. I can't see anything in the schematic that would cause you issues doing that. If you really want belt-and-braces against hum you can put an internal connection direct from the speaker 0V and input 0V to the earth post, but I don't think you'll need to.
Edit: or do what they did with their 0V and couple 0V to earth with a 10Ω resistor and a 47nF capacitor: https://keith-snook.info/quad-ii-mods-grey-pair.html
Sparky
Jonny69
That all looks very neat, and reversible. I'm going to stick with all the old connector types because I'm a big nerd. I was worried about how they'd fit an earth but the guy emailed me today and said it's best with these to just let them earth through the connectors to the pre-amp, which should have a proper earth. Not sure what pre-amp I'm going to run yet though - I want to be able to stream via Wi-Fi or Bluetooth from the laptop.