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Old 25th January 2012, 01:01 AM   #631
gl is offline gl  United States
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Hi Bluewater,

Sorry for not responding sooner.

Unfortunately I have missed Burning Amp the last two years because of schedule conflicts. The last time I attended I did indeed bring these amps. Alas there were too many other amps there and we didn't get to fire them up. Perhaps this will happen in 2012.

From the information you give on your heat sinks I am unable to advise you on whether or not they would work for the AX100J. If you run the outputs on separate heat sinks like I did then make sure your matching is as good as possible.

Most of the heat generated on my heat sink plates is dissipated within 3" or 4" of the output transistors. I believe that you could cut my heat sink plates down from 8" tall to 7" or even 6.5" and not see much of a net temperature rise. As I've stated before I would place the output transistors at different points on the plates if I had it to do over. Experience is a wonderful thing.

Most of the heat sink interconnect buses are 12ga tinned solid copper wire. Some are 12ga stranded wire that has been stripped of the PVC jacket. I don't think that silver plating would make an audible difference. You'll notice from the photo's that the output connections are very, very short.

I would encourage you to build this circuit. Like I stated in the last post I personally consider this to be one of the top power amp projects on this forum. And 'no' I haven't auditioned many of the others. And 'yes' I'm completely and arbitrarily biased - no pun intended.

Graeme

Last edited by gl; 25th January 2012 at 01:04 AM.
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Old 25th January 2012, 03:23 AM   #632
Variac is offline Variac  United States
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Bring those "same ole" amps in 2012 and I promise to get them in a system.The 5 listening rooms will help. I really want to hear them! It's Oct. 28th , you can start planning now!

Mark




Quote:
Originally Posted by gl View Post
Hi Bluewater,

Sorry for not responding sooner.

Unfortunately I have missed Burning Amp the last two years because of schedule conflicts. The last time I attended I did indeed bring these amps. Alas there were too many other amps there and we didn't get to fire them up. Perhaps this will happen in 2012.

Graeme
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Old 25th January 2012, 10:59 AM   #633
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Quote:
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Maybe I need to retire...
Don't we all.
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Old 25th January 2012, 07:37 PM   #634
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I definitly plan on building the Aleph-JX 100w mono amps. In fact I have 99% of the parts. Just earlier on I realized that I was jumping the gun with not enough experience and if I failed, well failure is not an option. I'm feeling more confidant now, especially with Eric's wiki on the subject. Thanks Eric! I only have one amplifier that I've built and that would be the F5. An amazing amplifier, the best sounding I have ever owned. I'm going to build the F2J next and if all goes smoothly I'll start the Aleph-JX monoblocks next. Experience is really what is keeping me from building the monoblocks.
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Old 26th January 2012, 01:46 PM   #635
Eric is offline Eric  United States
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Bluewater: I'm happy to hear that you found my web page of some use. I started the same way you did. The first amp I built was the a40 about 10 years ago. At the time, everyone else was here was building the Aleph2 or Aleph4 (very similar designs). I chose the a40 because there was a nice PDF on the PassLabs web site that had everything I needed. I wasn't about to tackle an Aleph design because there were just too many questions that I had.

After building my a40 (and making a few mistakes along the way), I began gathering parts for the newly developed Aleph-X. I still didn't have a great understanding of things and figured that if I spent my time gathering parts and following the thread, by the time I built my Aleph-X there would be plenty of people with enough experience to help me. My timing worked out pretty well, though I almost waited too long since by the time my Aleph-X amps were nearing completion, everyone else had moved on to the F-series of amps...

Have fun!
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Old 23rd October 2012, 06:25 PM   #636
gl is offline gl  United States
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These amps will at at BA 2012 this coming weekend. I have requested that they be put in the Pass room but I have left their use and location up to Mark (Variac).

It has been a few years since the amps or I have been to BA and I am looking forward to renewing friendships and being inspired by the cool things other folks build and bring.

Graeme
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