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Old 5th February 2014, 01:55 PM   #1
pioux is offline pioux  France
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Default 6080 monotriod amplifier

I discover a problem with my 6080 tube amplifier

1 6080 as monotriod , 2 ECC 88 in entry and one valve GZ 32 for power

I heard a low noise on my woofer and that independent from the volume level and entry selection

Noise may be 50Hertz , i am not sure .

I need to be at 20 cm from the loudspeaker (audax 33 cm 95 db for 1 volt ) to heard that ,

have you an idea about that

capacitor , valve , etc

Schematic is here

Image:17182 3767.jpg - AuDIYoFanWiki

thank's in advance
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Old 5th February 2014, 02:23 PM   #2
Tesla88 is offline Tesla88  Italy
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What happen if you disconnect source? I'm looking for ground loops here
What if you remove ECC88 ?
Also when you switch off the amp (main switch without unplug from socket) the noise fade away or stop immediately ?
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Old 5th February 2014, 03:42 PM   #3
pioux is offline pioux  France
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I will test
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