My 4 Fin 400 Grew 4 Fins

punchback

punchback

Journeyman
Joined
Jan 8, 2019
Messages
124
I had a little detour before powering up the 400 with the new WOA control board. While waiting for the exchange of the variac I fashioned extra cooling fins. I found 1 x 6 aluminum channel on they bay. After cutting off one edge I was left with the perfect size to become a pair of fins. I drilled and tapped some 10-32 holes in the back of the chassis. Ran some 3/4" screws through the holes to create some mounting Studs. I'll need to cut down the output transistor covers. It's got to be better than nothing.
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A smear of heat transfer compound might be another little bit. Looks good.
 
I'll probably end up doing that. I'm looking at doing some DIY anodizing in black. It looks relatively simple but I'm sure there's a little trial and error.
 
I'm sorry but I only bought 12" which was just enough to make 2 heatsinks. The item number on the bay is 202031500257. It cuts pretty easy with a table saw. When you cut it be prepared for aluminum chip to go everywhere. I did use one of my junkier saw blades.
 
punchback said:
I'm sorry but I only bought 12" which was just enough to make 2 heatsinks. The item number on the bay is 202031500257. It cuts pretty easy with a table saw. When you cut it be prepared for aluminum chip to go everywhere.
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No problem, sometimes you have to buy 6 feet in order to get 12". I try and see if I can get some. Thanks for looking up the Ebay number!
 
When you end up making the extra fins, I made a cardboard template of the chassis/heat-sink interface. It's easier to get the template to lay flat on the chassis first, then transfer the marks to the heat-sink. You have to cut two relief holes that you can see in one of the pictures.
 
Referring to heatsink grease, less is more. The grease replaces tiny air pockets, which are lousy heat conductors, on the surface of the heatsink. Who remembers the Brylcreem slogan?

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I probably ought to remove the fins and add some HS grease. I was wanting to try and anodize the HS black but who's going to see them and the grease would be an issue.
 
punchback said:
I probably ought to remove the fins and add some HS grease. I was wanting to try and anodize the HS black but who's going to see them and the grease would be an issue.
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And you will lose heat transfer to the new fins because of the anodize layer.
 
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