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Old 26th November 2012, 05:54 PM   #81
DF96 is offline DF96  England
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Screening is placing a grounded conductor in the way. That stops an electric field.

Mains transformers often hum a bit. Mount on rubber washers, but ensure you have a ground connection to the transformer frame.
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Old 26th November 2012, 08:25 PM   #82
pancaQe is offline pancaQe  United States
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Quote:
Originally Posted by DF96 View Post
Screening is placing a grounded conductor in the way. That stops an electric field.
I've never heard of that. So just running a conductor that attatached to ground in between a heater line and a signal line will block the field?
Mains transformers often hum a bit. Mount on rubber washers, but ensure you have a ground connection to the transformer frame.
This is the first amp of this size I've built, everything else has been SE 6BM8 or 6BQ5 amps. So I'm not used to a transformer of this size. It hums and buzzes.
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Old 26th November 2012, 08:45 PM   #83
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So I'm not used to a transformer of this size. It hums and buzzes.
Does it get hot too? Sounds like it's time for a new one.

jeff
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Old 26th November 2012, 08:52 PM   #84
DF96 is offline DF96  England
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AC heater wires can cause hum problems from both electric and magnetic fields. Twisting reduces the magnetic field.

The electric field can be reduced by running the wires in the corner of the chassis. This is because, to a limited extent, putting a grounded conductor behind can reduce the field. (See 'method of images' method for determining the field from a charge near an equipotential plane.) A screen all round is much better of course.
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Old 26th November 2012, 08:59 PM   #85
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Quote:
Originally Posted by pancaQe View Post
what do you mean by screening?
Screening = Shielding.
Radiator = Heatsink.
Anode = Plate.
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Old 26th November 2012, 09:08 PM   #86
DF96 is offline DF96  England
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Thanks. For us Brits a shield is something a soldier used to carry to protect him from sword blows. I know what others mean by a shield, but I forget that they might not know what I mean by a screen.
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Old 27th November 2012, 06:32 AM   #87
dgta is offline dgta  United States
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And bloody or bleeding does not necessarily involve hemorrhaging
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