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Make sure you understand power supply capacitors, bleed resistors etc. Know how to use a multimeter.
No use now as Barry is taking a sabbatical, but Ampmaker’s build guides are top-notch, full of practical advice that helps you avoid getting stuck in fiddly situations.
And here's how to make a neatly-twisted heater wire pair:Remember to take a step forward as the wires tighten up and shorten!
I tried this once, didn't work for me, the wire just went all coily-uppy
The little tab will just snap off with pliers. It shouldn't be necessary as long as you tighten the nut.