nad amp - internal fuse keeps blowing out

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hi guys,
im completely new to this forum, this is my first thread.

a few years ago i was given a NAD 3155 stereo amplifier and it sounded wonderful.
through no doubt my own fault i damaged it and now it wont power on (i think it blew when accidently not unplugging when changing speaker cables) since it blew i replaced the amp but 3 years on i am still desperate to get it working again.

I opened the case up to see a fuse (t2al 250v) had blown, this was located on the board with the power switch, i replaced the fuse and powered on without the case lid and saw the fuse blow under a second after the power switch was flicked. does anyone know what may be causing this? i presume that it is either a problem with the something on the power switch board or the actual power transformer. what should i do?
i do have a multimeter to test parts
please help!

thank you
jules
 
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