As a newbie looking at trying his hand at DIY valve amp building, I would like to know what specifications do I need to consider when purchasing a variac and isolation transformer? It would need to be standalone devices that I can pack away when not in use. If you can make suggestions on what to buy, it will be greatly appreciated as well.
I will also be making a dim-bulb tester.
I will also be making a dim-bulb tester.
