Quad 33 with JR149 speakers setup questions

Hello chaps!

I have just bought myself a quad 33 paired with 2
JR149 speakers, the quad has recently been refurbished by quad and the
speakers are in good nick!

I will be using my laptop to play my
music threw. I am wondering if you guys could give me some advice with
the set up and wiring as I am a bit of a novice.

I Currently have
my laptop plugged into “Radio 2” port (5 pin din) going to a RAC phono
thengoing into a 3.5mm jack converter then into my laptop.

I am
getting massive earth interference when the laptop is plugged in, with
my old sound system I removed the earth from the amp plug socket ( I
know this is very naughty !!) I really love my quad so I don’t want to
that this time.

I have found on the net that “ground loop
isolator” is the
cure? Are there any other suggestions that will be
cheap (as I am a student lameo) but not hinder the sound quality ?

Also
the speaker wiring and connections to the back of the power amp are, at
the moment very crude.

What gauge/type wiring do you guys
recommend ?

And what kit do I need to remove the earth problem ?

Thanks
a lot Oli