Recommend me a preamp please?

[Light Dependant Resistor]

There you go, Jez - that's you told. Didn't you know that balanced has two wires where single-ended has only one, so it's twice as dynamic? Looks like that squashed tomato is on yer face

Balanced uses three wires called Hot, Cold and Ground , unbalanced two wires Signal and Ground
Balanced is generally agreed to improve the transfer of signal by 6db

[RothwellAudio]

Balanced uses three wires called Hot, Cold and Ground , unbalanced two wires Signal and Ground

Yes, both single-ended and balanced connections have a ground wire - no surprise there. Where the single-end connection has one wire for the signal, balanced has two - which is what I said.

Balanced is generally agreed to improve the transfer of signal by 6db

Where a piece of equipment has a single-end output and a balanced output the balanced output is often 6dB higher than the single-ended. I don't think that's the same as improving the transfer of the signal by 6dB. In fact, I'm not sure what "improving the transfer of the signal by 6dB" actually means. A signal-to-noise ratio improvement, maybe?