Referring to my previous threat http://www.diyaudio.com/forums/showthread.php?s=&threadid=4158 I have made the following modifications to my Aleph 4:
- doubled heat sink capacity
- included 2 x 12 V low noise Pabst fans operating at 9V DC
The temperature has reduced to 65 C without the fans and 58 C if I have them turned on . I am still not satisfied to the extent that 65C is still quite hot and the fans can be heard at the listening position. I came across the article The Zen Variations – Part 3 “Active Supply Regulation” of Mr. Nelson Pass and consider converting my Aleph 4 into an Aleph 5. I would like to use the active supply regulation in order to reduce the rail voltage from +-48 to the requested +-34 without the need of changing my existing toroids. I do not really need the 100W of the Aleph 4 design and heat dissipation would go down from 500W to 300W what could easily be handled by my current heat sinks without using additional fans.
Since I love the sound of my current Aleph 4 the question really is what would happen. Does anybody have some experience comparing the 4 with the 5 and dares to make a statement? Will it be a side grade or downgrade? How will the active supply regulation influence the sound?
Furthermore the active supply regulation will generate some heat as well. The question is how much?
Regards,
Alois
- doubled heat sink capacity
- included 2 x 12 V low noise Pabst fans operating at 9V DC
The temperature has reduced to 65 C without the fans and 58 C if I have them turned on . I am still not satisfied to the extent that 65C is still quite hot and the fans can be heard at the listening position. I came across the article The Zen Variations – Part 3 “Active Supply Regulation” of Mr. Nelson Pass and consider converting my Aleph 4 into an Aleph 5. I would like to use the active supply regulation in order to reduce the rail voltage from +-48 to the requested +-34 without the need of changing my existing toroids. I do not really need the 100W of the Aleph 4 design and heat dissipation would go down from 500W to 300W what could easily be handled by my current heat sinks without using additional fans.
Since I love the sound of my current Aleph 4 the question really is what would happen. Does anybody have some experience comparing the 4 with the 5 and dares to make a statement? Will it be a side grade or downgrade? How will the active supply regulation influence the sound?
Furthermore the active supply regulation will generate some heat as well. The question is how much?
Regards,
Alois