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Old 1st August 2008, 07:43 AM   #1
jkeny is offline jkeny  Ireland
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Default IEC Inlet filter issue

I posted this on the Power Supplies section but got no responses so I'm trying here

I rescued a Schaffner IEC inlet filter from an ADAT M/C before I sent it to scrap. It's the FN 9246 High performance IEC inlet filter I have from here: http://www.schaffner.com/components/...22.asp?level=3 This unit has a 470K ohm resistor between L & N.

I put it on the inlet of a tube amp that I'm rebuiling. This amp has a switch and before using it I tested the power to ensure that all is OK.

I'm getting a voltage accross L & N with this switch turned to off. Do I need a dual gang switch instead or put a single pole switch before the inlet?
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Old 1st August 2008, 08:08 AM   #2
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It's not clear how you have wired this or exactly where voltage is appearing. Can you draw a diagram or explain a bit better?
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Old 1st August 2008, 09:00 AM   #3
jkeny is offline jkeny  Ireland
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Not good with the drawing of circuits so I'll try to draw a word picture:

All I've done is replace a normal IEC inlet with a filtered one and now when I measure accross the Neutral & Live wires inside the amp that connect to the trafo I see voltage there even though amp power switch is off.

I've since googled IEC inlet filters & see that they either use a dual gang switch after the filter or a single pole switch before the filter. I wasn't aware about these issues before.

Have others experienced this before?
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Old 1st August 2008, 10:06 AM   #4
Mooly is offline Mooly  United Kingdom
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Just draw it !! You are probably reading through some caps or something. A 0.1mfd across a switch will show voltage on the switched side with no load connected but there is no "current capability" with it. See how hard it is to explain without pictures
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Old 1st August 2008, 10:14 AM   #5
Mooly is offline Mooly  United Kingdom
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Like this.
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Old 1st August 2008, 10:55 AM   #6
jkeny is offline jkeny  Ireland
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Here's the best I can do:
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Old 1st August 2008, 11:11 AM   #7
Mooly is offline Mooly  United Kingdom
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Hi,
What program opens this. Haven't got MS Office
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Old 1st August 2008, 11:38 AM   #8
jkeny is offline jkeny  Ireland
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standard Word doc
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Old 1st August 2008, 11:44 AM   #9
Mooly is offline Mooly  United Kingdom
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Will try again. Just text ?
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Old 1st August 2008, 12:02 PM   #10
Mooly is offline Mooly  United Kingdom
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No luck, only got MS Works. --- Wordpad and notepad. Can read the text, thats all . My computer skills aren't that hot.
From what you say it sounds like you may be reading through caps etc. You say you have 228 volts was it on the tranny primary. But the amp is not powered ? like this. With 228 volts across the primary the amp has to be "on". If it isn't it's to do with where you are measuring from or the position in the circuit of the switch.
It's hard to say without seeing it, wait and see what Richie says.
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