By virtue of their electrical properties, tubes generate a special waveform when they're saturated, which is why tube engineering has tremendous tonal advantages over solid state or DSP solutions, particularly for crunch and lead sounds. Tubes enter the saturation zone gradually or softly, which lends tube-driven tone its trademark yet totally unique character.
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You could get a locking nut for quite cheap i think. Probably around £10 if thats what you mean. I'm not sure because i've never actually bought one seperatly. You will get buzz with those pick ups. You could try keeping your pickup selector 1 notch from the end and a pedal of and effects unit thingy will help reduce buzz. Also if you have your computer on near by it will cause you to get buzz. My friend found getting a better amp got rid of the buzz but that could be costly !
