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He thought the 3-3 was a simple introduction
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It is. It's a nice little amp to start with,if he builds the version without tone controls and follow the layout he can't go far wrong. If he uses a chassis a tad bit bigger than needed he can always add any tone controls etc later.
As others have said if he buys a mains tfmr that has extra current capability it gives him the chance to develop the amp further,it won't cost much more. Try and find the best OPT you can, the bigger the better. An OPT of about 10W would be grand. Hammond do an extensive range at a reasonable price as do Edcor. Not sure about Edcor but Digikey do Hammond tfmr's and as they're over £30 shipping is free and very quick, usually next day.
Lastly remember to bung a volume control on the front end, modern line sources like CD's can overload the amp that uses the original IP resistor values.
Good luck with your build, Andy.