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Old 14th August 2005, 03:22 PM   #441
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Default Up and playing

Built a new board yesterday. Got the amp playing this morning. It is the Rev A.
Like the sound, it seems rich and full. Gets the tonallity right, along with timbre. Lots of punch.
My speakers may not be optimal, 15 ohm, 100 dB efficient. The amp is pllaying at mW levels. The noise level is very low, measured 0.0 mv ac hum on initial check out. This required a little lead dressing, the speakers cables and input cable run right over the SIP bridge rectifiers.
I tried dowloading the image software, but only got down to 470K from the original 2.5 meg sizes. If someone more savy is willing I can send the pics. It is fairly nice, two boxes and very compact. The amp box is the heatsink.
Also get 13 and 10 mV dc offset. One channel in my first board wandered a little. Suspect the wiring on my part.


Enjoying a little Yoakam This Time,

George
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Old 14th August 2005, 03:28 PM   #442
maf_au is offline maf_au  Australia
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Default Re: Up and playing

Quote:
Originally posted by Panelhead
I tried dowloading the image software, but only got down to 470K from the original 2.5 meg sizes. If someone more savy is willing I can send the pics.
That sounds positive! Can't wait to get mine running...

You could send me the pics, I'll post em for you:

maf (at) adam.com.au
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Old 14th August 2005, 04:28 PM   #443
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Default Re: Up and playing

Quote:
Originally posted by Panelhead
Built a new board yesterday. Got the amp playing this morning.
Send me the pic I will post it.

Great job getting it working! I am glad you like it.
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Old 14th August 2005, 04:29 PM   #444
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Originally posted by Russ White

Send me the pic I will post it.

Oops, Michael beat me.
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Old 14th August 2005, 04:44 PM   #445
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Looks good, couldn't get it in a smaller case...

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Old 14th August 2005, 04:46 PM   #446
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Old 14th August 2005, 04:47 PM   #447
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Old 14th August 2005, 04:48 PM   #448
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Old 15th August 2005, 12:04 AM   #449
maf_au is offline maf_au  Australia
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Panelhead,

How warm does the alu case get?

That's a nice tight and original implementation. My only critisism is that you did not line the amps/PS up with the preamp in the last photo. I thought about adjusting it with photoshop, but it was late

Are the wooden-fronted cases next to the preamp chipamps as well? How does the sound compare?

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Old 15th August 2005, 12:19 AM   #450
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Default Heat

Quote:
Originally posted by maf_au
Panelhead,

How warm does the alu case get?

That's a nice tight and original implementation. My only critisism is that you did not line the amps/PS up with the preamp in the last photo. I thought about adjusting it with photoshop, but it was late

Are the wooden-fronted cases next to the preamp chipamps as well? How does the sound compare?

Michael

Michael,
Thanks for posting the pics. I should have posed the equipment a little better.
In my system the case does not get very hot. Today I took it over to a fellow equipment lovers place. His speakers are mid 90's efficiency and normal impedance. We played the amp much louder than I do at home. I would guess the case was 130 degrees F. after 20 minutes or so.
There is some aluminum plate inbetween the LM3886 and the case. This is for spacing and to help make a heat "sink". The case itself is too thin for good heat transfer.
The cases next to the preamp are power supplies. One for the linestage and one for my Pearl phono. I have quit building nice cases. I spend a month building a nice chassis, and a week on the circuit. Look on the pass forum for pics of my pearl and on the solid state for pics of the Tao buffer linestage and Hirega Le Monstre.
This is my first amp using a chip. Always built discrete before.


George
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