A75 revisited

Peter Daniel · 21st August 2002, 08:54 PM

This is what it takes to build A75.

For more pictures check http://www.diyaudio.com/forums/showt...2954#post52954

jwb · 22nd August 2002, 12:33 AM

What's with the zip ties?

Peter Daniel · 22nd August 2002, 02:07 AM

I was under the impression that if I pull the caps together I might eliminate their susceptibility to vibrations and microphonics.

I also placed damping material between them.

fcel · 22nd August 2002, 03:10 AM

I have always wondered what are the purpose of the ties around the capacitors. I have seen big can capacitors with metal strap around them. What is the real purpose for doing that?

Peter Daniel · 22nd August 2002, 03:20 AM

Metal strap at the bottom of the cap is used to screw the cap to the chassis. It's just a way to mount it.

fcel · 22nd August 2002, 03:26 AM

I meant metal straps that are installed half way up the capacitors .... just like what you did but it's metal strap. I believe I have seen Krell & Threshold amp doing that. Metal strap around the 4 big can capacitors.

Peter Daniel · 22nd August 2002, 01:29 PM

One can only hope those strps were not magnetic. It's not coincidence I chose plastic wraps.

audiousr · 22nd August 2002, 02:14 PM

Hi,
I recently wondered if it would be a good idea to use capacitor with different size to prevent resonant coupling between them. Sort of what they do in the oil storage tanks. Maybe one could group a different number of caps with the same size to get the same effect.
Also, wouldn't it make sense to reduce the cap size as much as possible to bring the first fundamental resonance out of the audio range? Echoes would have much lower intensity and would be less of a problem.
I heard caps in AC coupled amps resonate and that wasn't pretty. I found it tends to cause loss of focus in the sound.

Aud_Mot · 22nd August 2002, 02:55 PM

In the picture, are we looking at 2 discrete audio channels?

Are you using 24 ea TO-3 devices for one channel?

Nice milling.

Aud_Mot

Peter Daniel · 22nd August 2002, 02:59 PM

Two monoblocks, 24 devices per channel, separate active regulation for active stage.
Milling was the only elegant option with TO-3 devices and my sinks. The whole thing can be seen here: http://www.passdiy.com/gallery/a75-p7.htm

22nd August 2002, 02:07 AM	#3
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	I was under the impression that if I pull the caps together I might eliminate their susceptibility to vibrations and microphonics. I also placed damping material between them. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

22nd August 2002, 03:20 AM	#5
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	Metal strap at the bottom of the cap is used to screw the cap to the chassis. It's just a way to mount it. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

22nd August 2002, 01:29 PM	#7
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	One can only hope those strps were not magnetic. It's not coincidence I chose plastic wraps. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

22nd August 2002, 02:59 PM	#10
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	Two monoblocks, 24 devices per channel, separate active regulation for active stage. Milling was the only elegant option with TO-3 devices and my sinks. The whole thing can be seen here: http://www.passdiy.com/gallery/a75-p7.htm __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

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22nd August 2002, 12:33 AM	#2
jwb diyAudio Member Join Date: Mar 2002 Location: San Francisco, USA	What's with the zip ties?

22nd August 2002, 03:10 AM	#4
fcel diyAudio Member Join Date: Sep 2001 Location: LA County	I have always wondered what are the purpose of the ties around the capacitors. I have seen big can capacitors with metal strap around them. What is the real purpose for doing that?

22nd August 2002, 03:26 AM	#6
fcel diyAudio Member Join Date: Sep 2001 Location: LA County	I meant metal straps that are installed half way up the capacitors .... just like what you did but it's metal strap. I believe I have seen Krell & Threshold amp doing that. Metal strap around the 4 big can capacitors.

22nd August 2002, 02:14 PM	#8
audiousr diyAudio Member Join Date: Jan 2002	Hi, I recently wondered if it would be a good idea to use capacitor with different size to prevent resonant coupling between them. Sort of what they do in the oil storage tanks. Maybe one could group a different number of caps with the same size to get the same effect. Also, wouldn't it make sense to reduce the cap size as much as possible to bring the first fundamental resonance out of the audio range? Echoes would have much lower intensity and would be less of a problem. I heard caps in AC coupled amps resonate and that wasn't pretty. I found it tends to cause loss of focus in the sound.

22nd August 2002, 02:55 PM	#9
Aud_Mot diyAudio Member Join Date: Apr 2002 Location: California	In the picture, are we looking at 2 discrete audio channels? Are you using 24 ea TO-3 devices for one channel? Nice milling. Aud_Mot

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