Low ABV in sacrificial run

[LoStillo]

@Moderator: I'm sorry, I post this topic in wrong thread: please move it to Novice distillers!

I've got a small copper pot still. After a first run with water, last Saturday I did a sacrificial run using some cheap wine (12% ABV). I start collect over 82 °C and stop above 95 °C.
From 1 liter wine I get 150ml alchol.
Then, using a Gay Lussac alcholmeter I measured ABV: 30%. I would have expected something about 60% - 70%. It's correct or something was going wrong?
I would like to have other running using good wine to get some brandy so please give mo advice.