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Old 7th December 2011, 04:18 PM   #1131
GloBug is offline GloBug  Canada
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I think if you had it on the neutral side, the current could bypass the fuse by going through ground.
I don't know for sure either, but logically you would want to limit the current entering the amp.
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Old 7th December 2011, 04:20 PM   #1132
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Quote:
the current could bypass the fuse by going through ground.
Nah. The current can't hide . It has to pass from hot to cold.
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Old 7th December 2011, 04:27 PM   #1133
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I respect your knowledge, but I'm telling you for safety sake the fuse needs to be on the hot side, the first thing connected should be the fuse.

If a properly functioning amp draws too much current, then yes a fuse would work on the neutral side.

Try it for your self. Put a fuse on the neutral, then ground the hot, you'll pop your 15A breaker, not your 1 amp fuse.
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Old 7th December 2011, 04:53 PM   #1134
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ry it for your self. Put a fuse on the neutral, then ground the hot, you'll pop your 15A breaker, not your 1 amp fuse.
Ok. Put a fuse on hot. Then ground the neutral. Then the 15A breaker will pop also.

Since there is AC on the mains. I've never understood the difference between "hot" and "cold".

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If a properly functioning amp draws too much current, then yes a fuse would work on the neutral side.
That was my point.
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Old 7th December 2011, 05:06 PM   #1135
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It is an IEC socket with built in fuse.

I guess what I need to know is why the valves would instantly be drawing current. Before, there was about a 5-8 second warm up delay on the LED arrays, but then something changed and a screen resistor popped. And from then on, the LED array lit up straight away on power up.

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Old 7th December 2011, 05:10 PM   #1136
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Pull both output tubes and see if it powers up and stays up. If so, try each output tube in each socket to see if it is the tube, or something else in the circuit. Possible shorted grid in the tube, either g1 or g2 (screen).

Proceed from there.
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Old 7th December 2011, 05:24 PM   #1137
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OK will do. They are a brand new matched quad JJ EL84s so I hope that isnt the case.
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Old 7th December 2011, 05:31 PM   #1138
GloBug is offline GloBug  Canada
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Quote:
Originally Posted by Bas Horneman View Post
Ok. Put a fuse on hot. Then ground the neutral. Then the 15A breaker will pop also.

Since there is AC on the mains. I've never understood the difference between "hot" and "cold".


That was my point.
Because "Hot" is the one carrying the A/C, not the neutral or ground. You can touch these if you want, not recommended.

Neutral is ground. (At the panel)

The current can exit on either one, the point being a fuse on the neutral will not protect from a short to ground.

Last edited by GloBug; 7th December 2011 at 05:34 PM.
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Old 7th December 2011, 05:38 PM   #1139
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Originally Posted by Bas Horneman View Post
Wow. Do you have a fuse in your amp somewhere? Does that not blow first?
Can you suggest any reasons other than the shorted grids that this might be happening?
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Old 7th December 2011, 05:56 PM   #1140
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Post a good picture, maybe someone can spot something, never hurts to have a fresh set of eyes look at it.
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