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humming 2x25volt 300 va trafo


i have an trafo for sale, it is 2x25volt and 300va.
problem is it makes an humming noise, so i cant use it in my amplifier. maybe someone can use it for testing or so.

i bought the trafo a few weeks ago second hand, but when i tested it, i found out this noise. :(

i ask 10 euro's for this trafo.

greetings marnix