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Old 1st November 2011, 04:04 PM   #361
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Quote:
Originally Posted by JojoD818 View Post
That failure could had been easily fixed by adding an aluminum thermal bar across all the outputs.
Yes, but I was stubborn .
My chosen layout and heat sink height does not give much flexibility with mounting arrangements:

http://www.diyaudio.com/forums/solid...ml#post2719715

My only options now are to drill/tap a new set of 13 holes 1/2" away from the current set and live with the asymmetry, or to start again with a fresh
($$$) heat sink.

Last edited by discrete; 1st November 2011 at 04:09 PM.
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Old 1st November 2011, 11:46 PM   #362
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I must say I didn't check every voltage across the 0.22 resistors last time but only adjusted by the test points. This time it will happen though. All transistors weren't hot though and heatsink was at hottest luke warm.

Regard

Simon
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Old 5th November 2011, 04:26 AM   #363
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Quote:
Originally Posted by discrete View Post
Yes, but I was stubborn .
My chosen layout and heat sink height does not give much flexibility with mounting arrangements:

http://www.diyaudio.com/forums/solid...ml#post2719715

My only options now are to drill/tap a new set of 13 holes 1/2" away from the current set and live with the asymmetry, or to start again with a fresh
($$$) heat sink.
That's a nice looking board you got there. Though I'm biased with OS's approach because I love those casings with the heatsinks at the sides ala Krell.

You're right, I hope someday (in our lifetime) heatsink prices drops like a rock... though I doubt it...
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Old 5th November 2011, 04:27 AM   #364
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Slow day at the office...
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Old 6th November 2011, 01:34 AM   #365
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matched hfe for the LTP transistors...
applied thermal compound and tied the LTP transistors...
mounted and soldered...
I also did this to the small CCS transistors...
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File Type: jpg IMG_3116.JPG (487.8 KB, 571 views)
File Type: jpg IMG_3117.JPG (402.0 KB, 490 views)
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Old 6th November 2011, 01:36 AM   #366
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I wonder if nylon cable ties suffer from creep.
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Old 6th November 2011, 02:28 AM   #367
AJT is offline AJT  Philippines
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^not if that is a genuine nylon, besides those trannies do not heat up that much if at all.....
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Old 6th November 2011, 02:35 AM   #368
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Quote:
Originally Posted by 454Casull View Post
I wonder if nylon cable ties suffer from creep.
I have used the same in my more than 8 year old diy amp and so far I see no problem. The cable tie I used is somewhat stretchable and not that brittle.

I'd welcome it very much if you have a better technique to share.
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Old 6th November 2011, 02:38 AM   #369
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you can also use this "panduit" stainless steel ty-wraps.......Stainless Steel Cable Ties, Permanent Identification
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Old 6th November 2011, 03:00 AM   #370
mlloyd1 is offline mlloyd1  United States
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heat shrink tubing also works well here for small signal devices

mlloyd1
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