My DIY Aleph 5 is Alive!! - diyAudio
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Old 29th July 2009, 03:07 AM   #1
john65b is offline john65b  United States
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Default My DIY Aleph 5 is Alive!!

So here she is...I spent quite a bit on the chassis (thanks Cowrang), but I knew this amp would be a keeper. So far not disappointed....

Need a little more critical listening, but so far, I am happy...no hum, hiss or anything. DC Offset at 20mv and 17mv. .7v across R91 source resistors, 34.5V rails, 600VA Piltron tranny. Power Supply Filter is a 56kuf/.215 ohm/56kuf per channel. And she looks quite nice too. Still have to put in the 75C thermal cutoff and cool VU meter in the center hole...work I hope to hit this weekend...

Driving it is my Audionote M7 clone with LED Bias and other fun stuff...and a crappy Sony 400CD player as transport with a DIY Cirrus Logic CS4397 DAC that I am still modding...

And my Magnepan Tympani IVa's love it so far...

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Old 29th July 2009, 03:49 AM   #2
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Very nice. Glad you didn't waste much money on the TV, you had your priorities straight!
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Old 29th July 2009, 04:04 AM   #3
john65b is offline john65b  United States
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I garbage picked that LCD. Not too proud to pick, I say...

A new 12VDC SMPS and it sparked right up. Even my wife was impressed, which doesn't happen very often....

Besides, I have a projector based Home Theater in the other room....this TV needs to be just big enough to follow CNBC.
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Old 29th July 2009, 11:09 AM   #4
fff0 is offline fff0  Singapore
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Woww.... that casing is nice(Pass look alike)..... Where you got it from?
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Old 29th July 2009, 03:51 PM   #5
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Just put on the meter infront & it looks like the XA.5 series amp
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Old 29th July 2009, 05:17 PM   #6
john65b is offline john65b  United States
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The chassis came from our fellow member Cowrang. He had planned on making an Aleph 2 monoblock. I bought one and the other was sold to another member here. You can see the chassis on his Avatar
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Old 29th July 2009, 05:47 PM   #7
fff0 is offline fff0  Singapore
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Hi,

Thanks.
I saw it.
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Old 29th July 2009, 05:49 PM   #8
cowanrg is offline cowanrg  United States
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looks great! glad to see someone is using the case. there are a few of them out there...
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Old 29th July 2009, 06:34 PM   #9
john65b is offline john65b  United States
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Yes, that chassis really made the amp worth while. I sand blasted the inner panel that the output devices and heat sink bolt to in order to get the best heat transfer, and was considering sandblasting the heatsinks. I found a local shop that will Anodize the sinks after the sandblast, but decided to hold off until I see how the powerder coated sinks work out.

I ran it for a couple hours last night and had a thermocouple jammed into one of the top screw holes on the inner panel. It got no hotter than 110F on both sides. I also used Kapton insulators on the output devices for their superior heat transfer to the panel and sinks.

So far, quite happy. Now to finish the meter and thermal switch...
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Old 29th July 2009, 06:48 PM   #10
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Very nice. I'm hunting around for a chassis for my F5.

Does he have any left?
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