Guitar Amplifier Builders'
PVC HOOK-UP WIRE
18, 20 & 22 gauge stranded. Minimum 600v rating.
Good for any guitar amplifier wiring. Sold by the foot, in lengths or in spools.
Available in Green, Orange, yellow, White, Red, Black, Purple & gray.

20 awg    18 awg    22 Gauge 50ft spools 

20 Gauge PVC Hook-up Wire. 
600v. Stranded.

This wire will work for everything in most guitar amplifiers. Anything from a Fender Champ to a 100 watt Marshall.
Some guys like to step up to 18awg for their Filament (heater) wiring. You can find that below.
Available colors Green, Orange, White, Red, yellow, blue and Black.

$0.25 per ft.

18 Gauge PVC Hook-up Wire.
600v. Stranded.
Available in Purple and Gray.

$0.30 per ft.

22 gauge. 50ft. Spools

...$7.95 
50 ft. spool