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Old 11th January 2005, 08:04 PM   #491
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For all you builders who have never seen a KSA 50:

http://community.webshots.com/album/249287604tVVTpP

Prosit
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Old 11th January 2005, 08:55 PM   #492
lgreen is offline lgreen  United States
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Default getting started with heatsinks

My Mystery Amplifier should get me 1/2 way there, well at least as far as heat sinking goes.

Its big enough I suppose for an 8 channel KSA-50, but I'll probably use extra output devices on each channel and use half of it, saving the other half for something else.
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Old 11th January 2005, 10:25 PM   #493
NUTTTR is offline NUTTTR  Australia
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I'm going to be using MJE15030/31's as drivers from memory... I'm swimming in parts here, they are here somewhere....
I'm going for 4 pairs of outputs per channel, possibly depending on where it sits in the SOA, i might make it 6, i *think* the driver pairs and circuits will "support" it as such, i may need another pair of drivers - the KSA-100 had 2 pairs of drivers however only had 4 outputs, which makes me wonder a little....
Aaron

Jan - the parts you mentioned - 120v - 1a diodes - what were they for? i can't see where they'd popped up on original schematics
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Old 11th January 2005, 11:52 PM   #494
Coulomb is offline Coulomb  England
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So Jan, what do you consider to be the best output devices for this design if you were to stick with a TO-220/247 style casing?

Regards

Anthony
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Old 12th January 2005, 12:52 AM   #495
K-amps is offline K-amps  United States
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Depends on your heatsink. Remember the TO-3's are more robust at 250w vs the TO-3PL at 200w.
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Old 12th January 2005, 02:33 PM   #496
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NUTTTR:
The diodes are optional, however used in most amplifiers.
Their purpose is to prevent reverse collector-emitter voltages due to capasive and inductive loads (like the speakers crossovers and voice coil etc. )

Coulomb:
Why TO-247 casings? The selection is limited, however the MJW21193/94 from Onsemi are quite nice
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Old 13th January 2005, 04:32 PM   #497
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Default Paypal receipts thus far

Hi All who sent paypal payment-

Please see attached.
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Old 13th January 2005, 04:36 PM   #498
troystg is offline troystg  United States
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Default Bank tfrs

Hi all who sent bank Transfers-

I have rx'ed 2 transfers thus far.

Ipanema and Jozua

All others please reverify information and contact me via email.
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Old 13th January 2005, 04:41 PM   #499
troystg is offline troystg  United States
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Default Payment deadline

Hi All-

Payment deadline for boards will be tomorrow at noon.

I will be ordering the PCB's at 4 PM my time. (Central Standard Time USA)

Please email with any questions and sorry for any delay or poor communication.
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Old 13th January 2005, 04:45 PM   #500
troystg is offline troystg  United States
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And my posts would not be complete without:





http://www.diyaudio.com/wiki/index.php?page=KSA-50Wiki
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