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Old 28th January 2009, 08:12 PM   #7851
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Hello
I find this power suplly for ksa50 cann someone told me what values for L1 and L2
Thanks
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Old 28th January 2009, 09:49 PM   #7852
AndrewT is offline AndrewT  Scotland
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That is not a KSA50 PSU and it is not suitable for any KSA.
The +-10mF after the inductors prevents it working effectively.
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Old 12th March 2009, 12:53 AM   #7853
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Hello good evening to all the friends ...
I'm wanting to mount the amp. Krell KSA 50 ..
I would like to know the size of two plates of the same ...
grateful for the help of friends ..
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Old 12th March 2009, 10:29 AM   #7854
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Robby,

é voce fala sobre os disipadores de calor ?

37.5V * 1.8A *2 = 135W de calor o lado, no total 270W para estereo.
Without a fan (ventilador ?) you need a heatsink of 0.20 C/W minimum, or two heatsinks of 0.40 C/W for each channel.

(exemplo : Fischer SK56, 300mm*150mm*40mm, quatro partes para um ampli estereo)
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Old 12th March 2009, 02:25 PM   #7855
troystg is offline troystg  United States
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Thank you Jacco, you are a true gentleman.

I had no idea what he was requesting because of my limited "English only" American ignorance.
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Old 15th March 2009, 04:00 PM   #7856
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Hello good afternoon to all friends!
I'm mounting the amplifier Krell 50 and I have a question ... which is connected to where this written LOW! and if so it needs only a tripot from 5k to perfect their operation ... I appreciate everyone's attention!
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Old 15th March 2009, 04:10 PM   #7857
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pictures from power!
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Old 15th March 2009, 04:48 PM   #7858
AndrewT is offline AndrewT  Scotland
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Hi,
the two connections @ LOW go to a single pole switch or to a SPNO relay.

It gives the option to reduce the Bias to suit warm weather conditions or as a low power standby rather than switch off.

The LOW could be optimum ClassAB and the Normal could be the full ClassA bias.

Another option could be to monitor heatsink temperature and use a relay to switch the amp to a lower ClassA bias to reduce the heatsink temperature, with a warning light to tell you something is wrong.

Be careful to set the two bias pots to work as one adjustment for LOW bias and the other to work in parallel to give the high (normal) adjustment. Check the schematic in case I've got this back to front. This is not on the later PCB, I wish it was.
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Old 16th March 2009, 01:53 PM   #7859
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Hi!

I tried to pair transistors and the results are very divergent Hfe ~ 50%
My measurements:
MJL21194G 4 pcs. 884,890,867,925 mA
MJL21193G 4 pcs. 1370,1360,1360,1250 mA

How exactly pairs of output transistors to be paired?
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Old 16th March 2009, 02:06 PM   #7860
AndrewT is offline AndrewT  Scotland
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what are you measuring?
I see mA, that is not hFE.
How are you measuring?
How are you maintaining comparable temperatures?
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