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Old 18th October 2004, 03:48 PM   #31
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Hi all,
I have now drawn the KSA-50 mk.II schematic in my CAD software: http://www.delta-audio.com/temp_acd/...one_KSA-50.pdf
Please let me know your comments before I start the PCB-layout

To PMik:
I agree, however we do diy for fun
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Old 18th October 2004, 04:36 PM   #32
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C 107, 108 must be on CB not on BE.
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Old 18th October 2004, 04:43 PM   #33
fcel is offline fcel  United States
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Can anybody comment on how much it'll cost to built this clone - using non-exotic parts and excluding chassis cost.
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Old 18th October 2004, 04:44 PM   #34
zcolic2 is offline zcolic2  Croatia
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Yes, there is an obvious (symetrical) error on schematic that I gave link to. Base of TR10 should be connected with collector of TR8. As T11 with TR7. Thats, it. Waiting for suggestions on low power transistor replacements. Thanks all for contributing.

Regards,
Zoran
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Old 18th October 2004, 04:53 PM   #35
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Default Pavel

You are absolutely right
Please comment other errors, as I was drawing this schematic last night
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Old 18th October 2004, 05:13 PM   #36
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Schematic has been updated
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Old 18th October 2004, 05:49 PM   #37
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Jan, it must to stay Krell, not to be DuDu ( Dupont - Dudek ) , so only little notices : Q 105 - MPSA 92, Q 106 - MPSA 42 - Pc in this position is not big, so there is 0,5 W Pc enough ( MPSA .. or MPSW .. family ). Q 111 - give there some transistor in TO 126 ML ( full insulated - easy mounting ), such as 2 SC 3955 or similar. C 109 - give bigger value ( cca M1 - 1 M / 63 V). Current sense ( R 301, 302 ) is better to lead from both emiters of power devices ( value 4*200 R ). Give on rails blocking capacity ( + to G, - to G and + to - ). Other improvement are not required, 'cos Daniel d' Agostino is boss .
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Old 18th October 2004, 06:15 PM   #38
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Your suggestions sounds ok to me
And as you say, we must take care that we don't move the "project" too far away from original Krell (otherwise we could just make a new ourself a new amp) The "DU-DU Amp"
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Old 18th October 2004, 08:11 PM   #39
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Default zcolic2

Sorry for this late comment to your input....
If you look at the schematic I have uploaded, you see that this error in the schematic provided by you has been corrected
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Old 18th October 2004, 08:18 PM   #40
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By the way.............
Which Pc's do you suggest instead of MPSA 42 and MPSA 92 ???


I think it's possible to choose between a lot of different Pc's with the same pin configuration as the 42/92's So the printed name in the schematic doesn't matter
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