Goldpoint SA4M-47 passive 'preamp' winging its way to Marco Towers...

[struth]

Right, mains earth is connected to the case. Never disconnect that. From there (back of the binding post), 2 yellow and green wires go to the AC terminals on the bridge rectifier. From the + and - terminals the blue wires go to a screw post which is insulated from the chassis, and then to an insulated binding post (green wire heading out of view to the right). The white resistor and small blue capacitor are wired from chassis ground to signal ground (zero volt line on the circuit diagram). The toroidal transformer and circuit board are nothing to do with it, they are for charging the battery and powering the the remote control boards.
All clear now?
Or just ask a grown-up.

as clear as mud

[Marco]

Lol - yup. Kind of!

So now that you've outlined what's going on. What is the purpose of what you've done, and how might it cure the issue I'm having with hum, when the Croft is connected to the Copper amp?

You're assuming that what you've just written is self-explanatory, in that respect. Unfortunately however, it isn't unless you're a 'techy'.

Marco.

[Marco]

as clear as mud

Indeed! We is audiophiles and music lovers, not circuit designers

When I go to a restaurant and have a meal, I judge the quality of the food using my experience of what good food is supposed to taste like, based on what I'm used to eating at home, and what I've experienced eating in good restaurants over many years.

Don't ask me to cook the bloody stuff, though!

It's the same with hi-fi..... I'm simply an 'end user', not a builder. However, contrary to some, that doesn't make me any less skilled at what I *am* actually good at: identifying a good sound when I hear it and commenting accordingly.

Marco.

[awkwardbydesign]

God, and you people are fiddling with electric equipment? Care in the community or what!
(I've had a drink. Can you tell?)

[awkwardbydesign]

Lol - yup. Kind of!

So now that you've outlined what's going on. What is the purpose of what you've done, and how might it cure the issue I'm having with hum, when the Croft is connected to the Copper amp?

You're assuming that what you've just written is self-explanatory, in that respect. Unfortunately however, it isn't unless you're a 'techy'.

Marco.

Sorry, I added an explanation after you posted. Go back and have a look now.

[walpurgis]

(I've had a drink. Can you tell?)

At least it makes you seem less Er, stern? sombre? serious? Than usual.

(I've had a beer or two myself, otherwise I wouldn't have dared )

[Marco]

God, and you people are fiddling with electric equipment? Care in the community or what!
(I've had a drink. Can you tell?)

Not really, you're as daft as ever!

It's not me fiddling with electronic equipment, but a friend who knows what he's doing. I'm just the one who pays for the bits and judges whether the end results sound any good or not!!

Marco.

P.S It's handy having friends who are willing to help. Some poor sods elsewhere don't appear to enjoy that luxury...

[awkwardbydesign]

Before I listen to some actual music with a glass of Tesco's finest discounted Primitivo, I'd just like to say i find it fascinating that those who have no technical knowledge , those who have a little (me), and those who have bloody degrees in it , can all argue about it.
But obviously I'm right.

[struth]

Ive got city and guilds and was a class 1 engineer for longer than I care to remember.

[walpurgis]

I got my 'cycling proficiency' certificate when I was eleven.