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Old 14th January 2005, 08:00 PM   #531
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Krell KSA 50S
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Old 15th January 2005, 12:07 AM   #532
troystg is offline troystg  United States
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Hi All-

PCB order has been placed.

Ship date will be 01/28/05 my rx date 02/01/05.

I hope to have all the packages ready when they arrive, stuff the boxes and get them out the door the same week.

The Wiki has now been closed.
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Old 15th January 2005, 12:09 AM   #533
K-amps is offline K-amps  United States
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Good job!!
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Old 15th January 2005, 01:10 AM   #534
Coulomb is offline Coulomb  England
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Old 15th January 2005, 05:20 PM   #535
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Hi. Just starting on this thread. Just bought two PCB's
I would like to know what is the power supply needed by the amp. transfo rating, voltage. From the real KSA 50 pictures I saw that it is using 2 X 40,000uf caps per channel, it that OK?

Is it necessary to match the outputs transistors that are in parallel?
If yes, it will be pretty expensive to do, these MJ transistors are about 5.83U$ each, ouch

Thanks for your help.

Bye.
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Old 15th January 2005, 06:25 PM   #536
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Here a little thing I did, copper and silk on the same image, great to choose parts with proper pcb dimensions.
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Old 15th January 2005, 07:31 PM   #537
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Quote:
Originally posted by Algar_emi
Hi. Just starting on this thread. Just bought two PCB's
I would like to know what is the power supply needed by the amp. transfo rating, voltage. From the real KSA 50 pictures I saw that it is using 2 X 40,000uf caps per channel, it that OK?

Is it necessary to match the outputs transistors that are in parallel?
If yes, it will be pretty expensive to do, these MJ transistors are about 5.83U$ each, ouch

Thanks for your help.

Bye.
I think the original power supply will be fine. Most are thinking that a dual 30 volt secondary 800 watt number will get close to the original. The stock rails were 36 - 37 volt.
In the interest of the best sound the outputs should be matched. There are several options here, but I read that Onsemi will send you 25 samples of each if asked. I purchased mine, the price was 7.50 per 93//94 pair.
My amp is going to be a very low power one, KSA-15 or so. Only one pair of outputs per channel. It also is getting a CLC filter to get the noise low enough for my 100 dB efficient 15 ohm speakers.
For normal speakers, 2 or 3 pair of outputs are needed. The stock power supply should be plenty. This is suposed to be able to drive anything, including the current sucking planars.

George

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Old 15th January 2005, 07:32 PM   #538
djk is offline djk
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Part #
Mfr Description Stock Cross Available Pkg Qty Unit Price Qty Add to
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MJ15003
ON SEMICONDUCTOR BIP T03 NPN 20A 140V Stock 100
TRAY $2.1275


Future-active.com
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Old 15th January 2005, 07:34 PM   #539
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Algar_emi:
Nice
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Old 15th January 2005, 08:01 PM   #540
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And the output PCB.
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