Firstly, I'd like to replace the old screw-type speaker terminal connector with 5-way binding posts (as shown in picture A) for use of 8-ohm speaker. I plan to go about doing this by (a)de-soldering all the wires (wires 1 to 6 as shown in picture B) from the back of the connector, (ii)solder wires 1 & 2 (from amp's chasis and transformer's common) to tip of black binding post, (iii)solder wire 4 (the 8-ohm wire from transformer) to tip of red binding post, (iv)re-join wires 5 & 6 (I've been told that the 2 wires need to be joined to form a negative return to the circuit), and (v)cover the exposed leads of wires 3 and 5/6 with electrical tape to prevent touching of the chasis accidentally. Are these the right way to do?
Secondly, I'd like to know whether replacing the present 2-core thin power cord would improve sonic performance of the amp. If it does, can I replace it with a 3-core cable and hence is the connection going to be black wire to fuse ('b' in picture C), white wire to on/off switch ('a' in picture C), and green wire to chasis?
Thirdly, is there any good to re-wire all internal wiring with single-core of copper or silver wires? and what gauge of wire is suitable?
Thanks for any advice.