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 2.GQ Geiger Muller Counter
 GMC 320 plus v4 tube noise?		  New Topic  Reply to Topic
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Rogert

3 Posts
Posted - 08/18/2015 :  08:37:02  Show Profile  Reply with Quote
Recently received this counter and discovered it makes a 'soft' quiet noise at times, when moved. It sounds like a burned out incandescent light bulb filament striking the bulb. The device seems to function fine. I'm being cautious about moving it until I know what is happening. I sent an email to support last week. They must be busy.
Any ideas?
Reply #1

ZLM

1261 Posts
Posted - 08/19/2015 :  11:23:46  Show Profile  Reply with Quote
The sound is not from tube. It comes from a tube voltage step-up coil. It may make sound if the circuit oscillation in lower frequency (<16KHz)
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Reply #2

Rogert

3 Posts
Posted - 08/20/2015 :  11:38:11  Show Profile  Reply with Quote
Solid state electronics making noise upon movement? :/
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Reply #3

ZLM

1261 Posts
Posted - 08/21/2015 :  07:09:59  Show Profile  Reply with Quote
No. The noise is not from solid state. It comes from a coil due to the current changing in coil. If the coil tight enough, then the noise will disappear.
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Reply #4

Rogert

3 Posts
Posted - 08/21/2015 :  11:09:17  Show Profile  Reply with Quote
What I am hearing is only when unit is physically moved. Coil noise happens while unit is operating, movement or not, correct?
I open the battery door, put my ear close to tube and hear rattling only when softly tapping on housing. Like filament burned in incandescent light bulb. I also hear noise when setting unit on a table. These are the only times I hear rattling noise. I believe the tube filament is rattling against the glass tube, or the tube itself is moving.
I have heard coils scream, squeal, and make noise like a bad bearing. I have heard high voltage coils buzz in an old CRT. This is not coil noise. Something is loose and rattles with movement.
Is a replacement out of the question?
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Reply #5

ZLM

1261 Posts
Posted - 09/09/2015 :  21:10:52  Show Profile  Reply with Quote
I understand now.

The rattling noise is normal. The tube positive electrode is a long thing wire through the center of tube. If there is a movement, that wire may vibrate a little bit. The sound like rattling noise.

Every tube has this sound.
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