Question for The Tone God,, about his tube octave up

[Salvatore]

Hi Andrew, I'm Marcus,

I looked at you're site with the interesting schematics and found the Black Top tube pre/octave up.
http://www.geocities.com/thetonegod/black_top/black_top.html

I'm seduced in building it, but it does not state what base voltage it needs, 120 or 240 AC (or, are you from the UK or USA).

[The Tone God]

It will depend on the transformer but most dual primary transformers use a pair of 120v windings. Since you use only one winding as a transformer you would use 120v.

Andrew