class a running hot - Page 2

jacco vermeulen · 9th January 2006, 02:24 PM

Dude, we on the cold front would like a glance too.
Frie, you sun-freckled !

K-amps · 9th January 2006, 08:59 PM

Yeah with the frigid wave going through N. America (and sold out space heaters... all we poor audiophiles have to warm ourselves with our class-A amps... without them our kids would be very cold...

... thinking of selling the troublesome boy.... get another Krell.

WayneC · 29th January 2007, 03:29 PM

Hi Freo,

I was wondering if you have persisted with these little beauties as it has been extremely hot around your way jusy recently.

I had the same problem in Brisbane until I used twice the heatsinking capacity as shown by Silicon Chip, ie, one 300mm heat sink per module plus one 300mm for the dual power supplies(dual mono) and this proved most satisfactory

jamesfeline · 24th April 2007, 05:54 PM

Hello

My name is Nick from the UK and i have been making power amps for the last 20 years, this is my 1st response to this forum. Most of my amps have been designed by JLH. I was thinking of making the SC magazine 15w class a as described in this post. Any chance some of you could send me the CCT diagram and pics of your amps if you have constructed the amp in question ?

best regards

Nick

WayneC · 26th April 2007, 06:34 AM

Hello Nick,

I am new to all this as well so I will do my best. I built a few of these a couple years ago and was very happy with them and are available as a kit from Altronics in Perth or bare circuit boards in several guises from RCS Radio in Sydney. I think thay are better run as mono blocks utilising separate power supplies as the single power supply runs very hot , unless you use a large heatsink, powering dual channels. I will see if I can find a circuit diag but have moved house twice so hang in there.

PS They are very east to implement and mine powered a pair of 2 way Cabasses and B&W dm4s

jamesfeline · 26th April 2007, 04:12 PM

many thanks for the responce .... have ordered some kits today
thanks again

Nick

WayneC · 28th April 2007, 02:59 AM

Hi Nick,

I hope you enjoy listening to these 15 watters once they are up and running. They have sufficient sensitivity to run without a preamp so a volume control can be added if your source does not have the same and do take care to keep the power supply well away from {12 feet at least} from the amp to keep hum at bay. Should you run into trouble Silicon Chip do have a fault diag service via email for kits they devised.

Cheers
Wayne

9th January 2006, 02:24 PM	#11
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, Rotterdam or Curaçao	Dude, we on the cold front would like a glance too. Frie, you sun-freckled ! __________________ Not so much,.......if it says "ZM" in the corner.

29th January 2007, 03:29 PM	#13
WayneC diyAudio Member Join Date: Jan 2007 Location: Brisbane	15w class a Hi Freo, I was wondering if you have persisted with these little beauties as it has been extremely hot around your way jusy recently. I had the same problem in Brisbane until I used twice the heatsinking capacity as shown by Silicon Chip, ie, one 300mm heat sink per module plus one 300mm for the dual power supplies(dual mono) and this proved most satisfactory

24th April 2007, 05:54 PM	#14
jamesfeline diyAudio Member Join Date: Feb 2006 Location: Essex	15 w class a power amp Hello My name is Nick from the UK and i have been making power amps for the last 20 years, this is my 1st response to this forum. Most of my amps have been designed by JLH. I was thinking of making the SC magazine 15w class a as described in this post. Any chance some of you could send me the CCT diagram and pics of your amps if you have constructed the amp in question ? best regards Nick

26th April 2007, 06:34 AM	#15
WayneC diyAudio Member Join Date: Jan 2007 Location: Brisbane	15w class a Hello Nick, I am new to all this as well so I will do my best. I built a few of these a couple years ago and was very happy with them and are available as a kit from Altronics in Perth or bare circuit boards in several guises from RCS Radio in Sydney. I think thay are better run as mono blocks utilising separate power supplies as the single power supply runs very hot , unless you use a large heatsink, powering dual channels. I will see if I can find a circuit diag but have moved house twice so hang in there. PS They are very east to implement and mine powered a pair of 2 way Cabasses and B&W dm4s

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9th January 2006, 08:59 PM	#12
K-amps diyAudio Member Join Date: Nov 2003 Location: Indiana	Yeah with the frigid wave going through N. America (and sold out space heaters... all we poor audiophiles have to warm ourselves with our class-A amps... without them our kids would be very cold... ... thinking of selling the troublesome boy.... get another Krell.

26th April 2007, 04:12 PM	#16
jamesfeline diyAudio Member Join Date: Feb 2006 Location: Essex	many thanks for the responce .... have ordered some kits today thanks again Nick

28th April 2007, 02:59 AM	#17
WayneC diyAudio Member Join Date: Jan 2007 Location: Brisbane	Hi Nick, I hope you enjoy listening to these 15 watters once they are up and running. They have sufficient sensitivity to run without a preamp so a volume control can be added if your source does not have the same and do take care to keep the power supply well away from {12 feet at least} from the amp to keep hum at bay. Should you run into trouble Silicon Chip do have a fault diag service via email for kits they devised. Cheers Wayne

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