Krell KSA 50 pcb - Page 735 - diyAudio
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Old 4th April 2007, 12:46 PM   #7341
farl is offline farl  United Arab Emirates
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My emitter resitor is 0r68. Heatsink 0.4C/W.
Well you recommend to lower the bias to 250mV to play safe?

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Old 4th April 2007, 01:16 PM   #7342
AndrewT is offline AndrewT  Scotland
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Hi,
your temperature does not add up.

400mV & 0r68 =145W of dissipation.
Without de-rating the two sinks, the delta T is 29Cdeg.
Add on Tc deltaT and ambient and you're probably over 60degC for Tc.
Still OK, but I suggest you fit a latching temperature switch on each sink.

What would it cost (finance & aesthetics) to double the size of the sinks?
Then you can try to fully bias the output stage to 1.9A (or a little more) instead of 1.76A
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Old 4th April 2007, 03:33 PM   #7343
bluevas is offline bluevas  Indonesia
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Wink KSA 50 schematic

I like to build KSA 50. But there are many posts about this amplifier, and I confused where to start . Please help me find where is the schematic . Thank you guys.

Best regards,

Josh
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Old 4th April 2007, 06:02 PM   #7344
AndrewT is offline AndrewT  Scotland
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Hi blue,
you'll find all the detail here and in the links shown.
http://www.diyaudio.com/wiki/index.p...Building+guide
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Old 4th April 2007, 06:16 PM   #7345
troystg is offline troystg  United States
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I would be interested in a KAV-250, but it would have to be down the road once I get back on my feet. I've made progress, but not there yet.

As for me doing the kit GB, maybe in a year, certainly not right now.

I drew this diagram of the pwr supply for the people who bought my Krell that I had to sell.

Is it worth putting in the Wiki for an example?
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File Type: jpg krell and pass pwr supplies.jpg (75.8 KB, 862 views)
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Old 5th April 2007, 09:25 AM   #7346
konst is offline konst  United Kingdom
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Mark, any chance you can send out my Krell boards, which I paid you for almost 7 months ago, which you have not sent yet?
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Old 13th April 2007, 07:06 PM   #7347
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I had to dig this thread out of solid state - page 5!

Last night I realized that my KSA50 may be my favorite of all my amps right now. It just seems to be the one that does almost everything right - at the moment, and with the rest of my stuff.

Thanks to all that contributed.


....... now if we could only see them XA schematics
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Old 2nd May 2007, 03:10 PM   #7348
Thomo is offline Thomo  United Kingdom
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Hi everyone, just a quick 'un.

Does anyone still have a set of boards for sale please?

Lee.
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Old 2nd May 2007, 03:15 PM   #7349
troystg is offline troystg  United States
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Mark "might" still have some.
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Old 2nd May 2007, 07:41 PM   #7350
Thomo is offline Thomo  United Kingdom
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Quote:
Originally posted by troystg
Mark "might" still have some.
Thanks. How do I ask him though? It won't let me email him.

Lee.
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