Singing Leach amp while burning in

murat · 28th April 2006, 04:35 PM

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.

traderbam · 28th April 2006, 04:41 PM

How sweet. Which song did they sing?

infinia · 28th April 2006, 05:15 PM

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?

traderbam · 28th April 2006, 05:26 PM

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.

murat · 28th April 2006, 05:32 PM

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.

bremen nacht · 23rd May 2006, 07:41 PM

Mine does that too. I suspect the big ceramic emitter resistors, or the output resistor/inductor.

richie00boy · 23rd May 2006, 07:52 PM

I have experienced this too on a high power pro amp when I was in the r&d dept of a pro audio company.

Eva · 23rd May 2006, 08:16 PM

Wirewound resistors and inductors are very likely to sing. Capacitors aren't. Mains transformers will also sing but in a different way.

AKSA · 24th May 2006, 08:58 AM

I've always preferred singing amps. The ones that hum aren't very musical, and obviously don't know the words......

Hugh

Raka · 24th May 2006, 09:59 AM

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.

28th April 2006, 04:35 PM	#1
murat diyAudio Member Join Date: Nov 2004 Location: knoxville tn	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.

28th April 2006, 05:15 PM	#3
infinia diyAudio Member Join Date: May 2005 Location: Californication	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? __________________ like four million tons of hydrogen exploding on the sun like the whisper of the termites building castles in the dust

23rd May 2006, 07:41 PM	#6
bremen nacht diyAudio Member Join Date: Feb 2004 Location: england	Mine does that too. I suspect the big ceramic emitter resistors, or the output resistor/inductor. __________________ All this radio needs is a fuse

23rd May 2006, 07:52 PM	#7
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	I have experienced this too on a high power pro amp when I was in the r&d dept of a pro audio company. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

23rd May 2006, 08:16 PM	#8
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	Wirewound resistors and inductors are very likely to sing. Capacitors aren't. Mains transformers will also sing but in a different way. __________________ I use to feel like the small child in The Emperor's New Clothes tale


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28th April 2006, 04:41 PM	#2
traderbam diyAudio Member Join Date: Jan 2002 Location: Earth	How sweet. Which song did they sing?

28th April 2006, 05:26 PM	#4
traderbam diyAudio Member Join Date: Jan 2002 Location: Earth	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.

28th April 2006, 05:32 PM	#5
murat diyAudio Member Join Date: Nov 2004 Location: knoxville tn	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.

24th May 2006, 08:58 AM	#9
AKSA diyAudio Member Join Date: Sep 2001 Location: Melbourne, Australia	I've always preferred singing amps. The ones that hum aren't very musical, and obviously don't know the words...... Hugh __________________ Aspen Amplifiers P/L (Australia) www.aksaonline.com

24th May 2006, 09:59 AM	#10
Raka diyAudio Member Join Date: Aug 2002 Location: Close to Oistrakh	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. __________________ What is beyond the speaker?

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