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Old 19th February 2013, 04:53 PM   #41
6L6 is offline 6L6  United States
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Click the image to open in full size.

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The 100W incandescent light bulb goes in series on the live lead of a powercord. It's a resistor this way, and if there is a big current draw, it will limit the current by lighting up, which also indicates that there is a problem.
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Old 19th February 2013, 07:24 PM   #42
PKI is offline PKI  United States
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6L6, would you be so kind to post a link(mouser/digikey) on these pink silpads you use, please? I can't find them in this(big) size... :-( I use aluminum oxide and I do not like the result, the transistor is noticeably hotter than the sink next to it. Maybe, you can even measure this temperature difference? Thanks!
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Old 19th February 2013, 08:03 PM   #43
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I got these: Q3-0.005-00-51 Bergquist Company | Mouser
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Old 19th February 2013, 08:11 PM   #44
PKI is offline PKI  United States
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are those sold in sheets or not? I need them for Fairchild's — TO-247-3, I guess.
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Old 19th February 2013, 08:19 PM   #45
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They're individual pieces sized to fit TO-247 at 0.687"x0.562"

You can look for different options here:
Mouser Electronics - Catalog Viewer
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Old 19th February 2013, 08:26 PM   #46
PKI is offline PKI  United States
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Thanks I see!
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Old 19th February 2013, 08:44 PM   #47
6L6 is offline 6L6  United States
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You really want the pink ones - the black have about 4 times less thermal conductivity...

The pink can be found here - SP900S-0.009-00-104 Bergquist | BER178-ND | DigiKey I assume Mouser has the same in stock.
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Old 19th February 2013, 08:49 PM   #48
PKI is offline PKI  United States
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In this case these should be the best: SP2000-0.015-00-104 Bergquist | BER200-ND | DigiKey
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Old 19th February 2013, 09:09 PM   #49
6L6 is offline 6L6  United States
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Yes, that looks great!

The ones you linked are TO-220, do they have any in TO-247?
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Old 19th February 2013, 09:10 PM   #50
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Haven't looked closely, but thickness plays into it as well.
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