Building an F5 Turbo v2 (in-Progress) - Page 5

6L6 · 19th February 2013, 04:53 PM

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.

PKI · 19th February 2013, 07:24 PM

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!

oneplustwo · 19th February 2013, 08:03 PM

I got these: Q3-0.005-00-51 Bergquist Company | Mouser

PKI · 19th February 2013, 08:11 PM

are those sold in sheets or not? I need them for Fairchild's — TO-247-3, I guess.

oneplustwo · 19th February 2013, 08:19 PM

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

PKI · 19th February 2013, 08:26 PM

Thanks I see!

6L6 · 19th February 2013, 08:44 PM

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.

PKI · 19th February 2013, 08:49 PM

In this case these should be the best: SP2000-0.015-00-104 Bergquist | BER200-ND | DigiKey

6L6 · 19th February 2013, 09:09 PM

Yes, that looks great!

The ones you linked are TO-220, do they have any in TO-247?

buzzforb · 19th February 2013, 09:10 PM

Haven't looked closely, but thickness plays into it as well.

19th February 2013, 04:53 PM	#41
6L6 diyAudio Member Join Date: Oct 2010 Location: Denver, Colorado	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. __________________ llustrated Build Guides - Pass Pearl 1 - Pass B1 - - Pass F5 - Pearl 2 - -O2 HPA - - Pass F4

19th February 2013, 08:03 PM	#43
oneplustwo diyAudio Member Join Date: Apr 2009 Location: San Francisco	I got these: Q3-0.005-00-51 Bergquist Company \| Mouser __________________ My Projects

19th February 2013, 08:19 PM	#45
oneplustwo diyAudio Member Join Date: Apr 2009 Location: San Francisco	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 __________________ My Projects

19th February 2013, 08:44 PM	#47
6L6 diyAudio Member Join Date: Oct 2010 Location: Denver, Colorado	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. __________________ llustrated Build Guides - Pass Pearl 1 - Pass B1 - - Pass F5 - Pearl 2 - -O2 HPA - - Pass F4

19th February 2013, 09:09 PM	#49
6L6 diyAudio Member Join Date: Oct 2010 Location: Denver, Colorado	Yes, that looks great! The ones you linked are TO-220, do they have any in TO-247? __________________ llustrated Build Guides - Pass Pearl 1 - Pass B1 - - Pass F5 - Pearl 2 - -O2 HPA - - Pass F4


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19th February 2013, 07:24 PM	#42
PKI diyAudio Member Join Date: Aug 2011	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!

19th February 2013, 08:11 PM	#44
PKI diyAudio Member Join Date: Aug 2011	are those sold in sheets or not? I need them for Fairchild's — TO-247-3, I guess.

19th February 2013, 08:26 PM	#46
PKI diyAudio Member Join Date: Aug 2011	Thanks I see!

19th February 2013, 08:49 PM	#48
PKI diyAudio Member Join Date: Aug 2011	In this case these should be the best: SP2000-0.015-00-104 Bergquist \| BER200-ND \| DigiKey

19th February 2013, 09:10 PM	#50
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	Haven't looked closely, but thickness plays into it as well. __________________ \|F6 Kit/Trasnformer GB Sign up sheet Closed,\|Primrose GB Sign Up sheetClick Here ...Shape the sound , Man!

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