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Finally put it back in the since the reading on the multimeter was wrong.

Seem to been an 'cold' joint inside the circuit, the amp is working correctly now, linking the channel is OK.

It is normalt tha the bright channell seems to be a little less powerfull than the normal One?

Glad you solved the problem.

Depends what you mean by 'more powerful.' All other things being the same, the bright channel has more gain at higher frequencies, but that might not come across as 'powerful.'

However, all other things are likely not the same. The gain of the first tube is maxed out in this circuit - so the voltage gains of the two halves of individual tube being used actually sets the gain. Differing (sample-to-sample) tube gains will have an effect on the input stage gains.