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Threshold Amplifier - Overview and Schematic Collection of all Models
Threshold Amplifier - Overview and Schematic Collection of all Models
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Old 2nd January 2018, 10:03 AM   #101
ADH is offline ADH  Germany
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Smile Threshold SA/11m

Sorry for the second post doubled. Get a failure message and thought it didn't work :-)
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Old 2nd January 2018, 10:13 AM   #102
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Threshold Amplifier - Overview and Schematic Collection of all Models
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Old 2nd January 2018, 02:32 PM   #103
Zen Mod is online now Zen Mod  Serbia
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Threshold Amplifier - Overview and Schematic Collection of all Models
change something in signal wiring , or change something in mains cables - find a way to break safety earth for , say, monos

use either cables without safety earth wire , or T adapters without the same

be aware that you can use that trick only when everything is connecetd , so amps without safety gnd connected through mains cables are effectively having safety gnd through signal cables

pretty much normal thing in PA gear , most amps having switch on back side for several arrangements of safety gnd
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Old 2nd January 2018, 02:42 PM   #104
RobertS61 is offline RobertS61  Netherlands
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Possibly a groundloop.
Try to ground only the pre-amp and keep the rest floating.

Nice setup by the way.
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Old 2nd January 2018, 03:00 PM   #105
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Threshold Amplifier - Overview and Schematic Collection of all Models
I did replied in other thread you posted
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Old 2nd January 2018, 03:09 PM   #106
ADH is offline ADH  Germany
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Thank you, I try first with some isolating material between plug and socket earth wire of the amps. I'll keep you informed
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Old 2nd January 2018, 07:13 PM   #107
Nelson Pass is offline Nelson Pass  United States
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Threshold Amplifier - Overview and Schematic Collection of all Models
When you start multi-amping, noise generated by ground loops starts to
rear its ugly head. Most often the loop is in the AC Earth connection, so
that is a good place to start. I usually isolate the AC Earth on various
pieces to see how it affects the noise and proceed on that information.
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Old 2nd January 2018, 08:50 PM   #108
ADH is offline ADH  Germany
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Hallo Mr. Pass,

thanks for your response. Im not sure about the wording, is this platelelet (metallstrip can be seen in the front of the picture, the ac earth (or ground)?

Hope the upload works
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