Review By Build - NAP 200

[Jrp27]

After one year of procrastinating, finally i have been able to assemble the amp. Here is my setup:

1. Copper Bar - 13mm thick and 170 mm long. Bolted to the aluminium Base plate.

2. Aluminum Base Plate : 3mm Sheet. Full sheet size ( 260*350*3 mm )

3. Clamp - 16mm Aluminium Clamp on the Sanken's

The sanken's will be mounted to the copper bar with mica insulation and thermal grease. The base plate will be mated to the chassis and i will be drilling a few holes on the chassis. I live in india and the temperature in summers goes upto 40-45 deg Celsius or 108 Fahrenheit.

Here are the images.

Is this setup okay? any reviews / comments

 

[Mark Tillotson]

Interesting approach - if you paint the aluminium sheet black it will radiate heat much more effectively. Only paint the side away from the PCB.

 

[TNT]

Are the bolts magnetic (iron)?

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[Jrp27]

Are the bolts magnetic (iron)?

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They are iron bolts but i intend to replace them with brass ones.

 

[Vrystaat]

I have used copper before in that same arrangement, it works very well but it must be machined to make good contact between the transistors and the chassis/heatsink.

 

[minek123]

Are the bolts magnetic (iron)?

They are not supposed to be iron (steel) ?
What will happen if they are??

 

[Jrp27]

I have used copper before in that same arrangement, it works very well but it must be machined to make good contact between the transistors and the chassis/heatsink.

I did the best i could by sanding the copper bar. It might not be a perfect fit but it's close enough....