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Old 29th October 2004, 12:41 AM   #1
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Default Odd hum problem

I have an Antique Sound Lab MG-s115 that has a strange hum
problem. This amp has a built in volumn controle. When the volumn controle is at 1/2 rotation I have maxium hum, turn it
up louder and the hum decreases ! Any idea what would cause
this?

Thanks,
Woody
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Old 29th October 2004, 01:01 AM   #2
anatech is offline anatech  Canada
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Hi Woody,
The volume control presents the maximum impedance to the input circuit around 1/2 resistance. A load on the input (source like a CD or buffered preamp) would reduce or eliminate this.
You can also try shielding the volume control and leads. Also watch where your input wires run from the jack to where ever.
-Chris
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Old 29th October 2004, 01:16 AM   #3
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Thanks , that was the problem. I just couldn`t see it.

Woody
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