AC neutral return caused main fuse to jump

Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

I am running an amp without PT just to hear how the sound is like. It is risky, so I do not suggest any one else to do it. I used lots of precaution and have been playing with electricity for a long long time since the radio was still tubes.
Anyway, when I connect the amp to the cable tv decoder, the main fuse jump. Eventually I found out that the natural AC line that is connected to my amp chassis caused the fuse to jump when it is in contact to ground.
Can any one explain how the protection circuit work? as measured by my meter, the potential different between the ground and neutral is about 1 volt only.
Anyway, since the short circuit occurred when I connect my media player HDMI to the LED monitor where there were HDMI from the cable TV, my media player can't turned on now...

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Topic - AC neutral return caused main fuse to jump - wlee 15:10:28 12/06/10 (6)

Is AC neutral really 'neutral'? - 6AS7_6SN7 03:24:52 12/07/10 (0)

RE: AC neutral return caused main fuse to jump - mikeyb 16:46:47 12/06/10 (0)

RE: AC neutral return caused main fuse to jump - Stuben 15:37:38 12/06/10 (3)

RE: AC neutral return caused main fuse to jump - wlee 15:49:06 12/06/10 (2)

RE: AC neutral return caused main fuse to jump - Jim Doyle 16:49:20 12/06/10 (1)

RE: AC neutral return caused main fuse to jump - wlee 17:51:16 12/06/10 (0)

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