I had so much fun building the 5E3 that I decided to start the next one. I'm planning on doing an 18 Watt build, and have spent ages reading through the 18 Watt forum and looking at schematics. A lot of the schematics and layouts I've printed out are really similar. All list 120V wall voltages, but some have 1A fuses, others have 2A fuses, some don't list a value at all. It made me realise I don't understand the fuse value at all. After a lot of google-fu I have read all sorts of conflicting advice, including: - That for amps under a certain wattage it doesn't matter as long as it's less than a 3A fuse - That the swap from 120v to 240V wall voltages should halve the fuse value - That the fuse value is circuit dependent so it should be left as listed Unsurprisingly, I'm feeling a bit confused. Can anyone explain what I should be doing if (for example) I work from a layout/schematic like the Valvestorm 18W TMB (which has a 1A fuse and 120V primary on the PT)?