Tranformer question

[CPX]

Helo I have o short question.I have a 100 w transformer
220 v -> 2*48 v ca. I need to increase the voltage up to 58 v ca
There is no room to add any isolated copper wire in the secundary
so i have to take some out of the primary.So,the queston is how much i can take without causing damage in the long run to the transformer...i should take about 20% for 48->58 increase in voltage...The resistance of the primary is 32 ohms if it helps.
10x

[richie00boy]

You can't take any out of the primary. If you do you will cause the core to be saturated and the transformer will burn out.

[Sch3mat1c]

What he said.

However, you can add a buck transformer to the secondary to increase it by as many volts. You'll need one buck transformer (or as many windings) per winding on your transformer. In your case, you need two 10V 1A windings. A single 20VA dual secondary unit would work.

Tim

[CPX]

thanks for the ansers...unforcentaly i can not use a secondary transformer because there is no space.....because what i do is restauration of an old amplifier+pick-up and i want to leave hin as close to the original as posible...there is no room As i read from the internet it is posible that the tranformer has a safety margin ..some transformers even have huge safety margins about 30% more izolated coper than the limit....i have no iddea how to test that..any good ideas apreciated..10x