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Old 27th May 2009, 08:56 AM   #7921
Adi2009 is offline Adi2009  Poland
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>jacco vermeulen
What should I do? Put heatsink horizontal? One heatsink or two? I have no experience with A class amps. Sorry for my questions.
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Old 27th May 2009, 08:58 AM   #7922
AndrewT is offline AndrewT  Scotland
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build the amp vertically.
smoothing and rectifiers at the bottom.
Transformer in the middle.
Amplifier near the top.

Access the whole assembly through a removable side panel.
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Old 27th May 2009, 09:16 AM   #7923
Adi2009 is offline Adi2009  Poland
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Maybe I should cut the heatsink, then I'll have two parts long 10,5cm each. one will be on the right chanel and the second on left chanel.
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Old 27th May 2009, 09:17 AM   #7924
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Quote:
Originally posted by Adi2009
What should I do
KISS.

With a single heatsink placed horizontal in the center of the amp you'll have plenty of space on both sides for a transformer and electrolytics.
You really do not need two of those heatsinks for a KSA50.
Only downside is that the amp requires an air intake at the front, personally i find that even somewhat pretty.

Last high vertical blown amps i assembled were 80W class A hybrid monoblocks in '89/'90, which measured 40cm wide by 40cm deep, and 30cm high.
Not everyone's cup of tea.

Small warning, laminar heatsinks are not so easy to saw, you'll risc that they falll apart if you do not take precautions.
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Old 27th May 2009, 09:29 AM   #7925
Adi2009 is offline Adi2009  Poland
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Thanks. Which way is better?
Do you know how hot will it be?
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Old 27th May 2009, 09:57 AM   #7926
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Right one is easier, but i would attach the TO3s the way Nelson Pass did in the Threshold amps.

The temperature of a blown heatsink tunnel is not a semi-constant value, lowest is where the cold air enters and highest where the heated air exits.
Center temperature (half way) of your heatsink will be in the order of 40-45C for 1.6A bias and 37.5Vdc rails, and 45-50C for 50Vdc rails.(25C ambient)

In case you're curious what a forced cooled laminar heatsink can do : Here
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Old 27th May 2009, 10:07 AM   #7927
Adi2009 is offline Adi2009  Poland
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>Right one is easier, but i would attach the TO3s the way Nelson Pass did in the Threshold amps.

How did he do?
Could you give me WWW - address with example ?
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Old 27th May 2009, 10:13 AM   #7928
ccschua is offline ccschua  Malaysia
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Has anyone made a comparisons between the sound of Krell KSA50 vs F5. Both are quite similar in the power range.
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Old 27th May 2009, 10:19 AM   #7929
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Quote:
Originally posted by Adi2009
address with example
Here , click any of the Threshold models for an example picture.

Now i'm off this thread, good luck with your build.
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Old 16th June 2009, 07:17 AM   #7930
Adi2009 is offline Adi2009  Poland
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I have schematic with krell ksa50 mkII. Supply voltage is +-50V. Is it ok? I have two transformers 450VA 2x35V AC and I wonder - can I use it?
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