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Old 28th April 2006, 05:35 PM   #1
murat is offline murat  United States
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Default Singing Leach amp while burning in

When I was burning in my Leach amp at some high power (I don't think max power) with dummy load I was able to hear the amp clearly singing. I used caps recommended by Prof Leach and I think non of them were ceramics. So what was singing and do I need to worry about this? Thanks.
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Old 28th April 2006, 05:41 PM   #2
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How sweet. Which song did they sing?
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Old 28th April 2006, 06:15 PM   #3
infinia is offline infinia  United States
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Hi
Probably check your loads (wire wound resistor?)
You can use a larger dia. heatshrink tube to your ear to localize the source.
Use Elvis P.'s song "Are You Lonely Tonite" for source music. Tenn?
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Old 28th April 2006, 06:26 PM   #4
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Perhaps, "In the heat of the night" or "Smoke Gets In My Eyes"...?

IME this noise can emanate from the vibrations of either power transistors or resistors when they pump large ac currents. Nothing to worry about unless you've got a short somewhere you don't know about.
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Old 28th April 2006, 06:32 PM   #5
murat is offline murat  United States
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Funny guys we have here

Was that song supposed to be "Are You Lonesome Tonight". I expect to get quite some improvement from it.

The loads were wire wound but they were not singing.
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Old 23rd May 2006, 08:41 PM   #6
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Mine does that too. I suspect the big ceramic emitter resistors, or the output resistor/inductor.
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Old 23rd May 2006, 08:52 PM   #7
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I have experienced this too on a high power pro amp when I was in the r&d dept of a pro audio company.
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Old 23rd May 2006, 09:16 PM   #8
Eva is offline Eva  Spain
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Wirewound resistors and inductors are very likely to sing. Capacitors aren't. Mains transformers will also sing but in a different way.
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Old 24th May 2006, 09:58 AM   #9
AKSA is offline AKSA  Australia
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I've always preferred singing amps. The ones that hum aren't very musical, and obviously don't know the words......

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Old 24th May 2006, 10:59 AM   #10
Raka is offline Raka  Europe
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It happened alsto to me, I had a panic moment when I clearly heard the Rite of spring without speaker. I think there are two answers to this: Or the wirewounds are singing or Stravinsky is back.
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