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Krell KSA 100mkII Clone
Krell KSA 100mkII Clone
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Old 19th March 2017, 12:48 AM   #2731
Mark Allen is offline Mark Allen  United States
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Does a schematic of the KMA-100 exist?

Mark
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Old 23rd April 2017, 04:43 PM   #2732
Ricren is offline Ricren
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Quote:
Originally Posted by Kaplaars View Post
I have stopped with posting updates. I have made quite some improvements, especially with more efficient use of the heatsinks.
Click the image to open in full size.
Hi Kaplaars, please post your improvementes, it's always nice to read somenthing from you.
regards
Ric
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Old 23rd April 2017, 06:13 PM   #2733
Ricren is offline Ricren
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Did it used to be a KSA100 WIKI? the KSA50 wiki is great.
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Old 23rd April 2017, 09:34 PM   #2734
Mark Allen is offline Mark Allen  United States
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Do those Wiki's still exist? If they do where are they now?

Mark
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Old 23rd April 2017, 09:41 PM   #2735
Ricren is offline Ricren
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KSA50 wiki:

Krell KSA-50 clone Building Guide
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Old 24th April 2017, 12:31 AM   #2736
Mark Allen is offline Mark Allen  United States
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Thanks!
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Old 27th April 2017, 01:04 AM   #2737
Ricren is offline Ricren
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io, looking for the best thermal pads for the TO3 devices. Would this be the best choice?

https://www.digikey.com/product-deta...R171-ND/307793

thanks.
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Old 27th April 2017, 06:31 AM   #2738
AndrewT is online now AndrewT  Scotland
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I don't know about "best".
Does it fit your devices?
Does the Rth c-s meet your requirement?
Does it insulate for the voltages you intend to use?
Does it have a one use limit? Is that OK?
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regards Andrew T.
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Old 27th April 2017, 03:29 PM   #2739
Ricren is offline Ricren
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Ok Andrew, thank you for your answer, I'll try to be more specific:

General: Itís been a while (almos 20 years) since I build an amp with TO3 devices so I wonder if thereís some new material that i could use for isolators besides mica. So for my ongoing KS100 clone with 4 pairs of TO3 devices, I'm looking for the more thermally conductive material I could pay.

You say:
Does the Rth c-s meet your requirement?
Barely i think, but this is my first time building a "heater" amplifier like this with T03 devices and I'd like to get the best thermally conductive material.

Does it insulate for the voltages you intend to use?
It was my understanding that almost any isolation (mica or pad ) was good for less than 50 volts?

Does it have a one use limit? Is that OK?
Yes, it's fine to discard them in case of transistor replacement if that makes it more thermally conductive. The original Krell is a very hot amp so anything we can do to control heat is welcome.

Any suggestions? Last time i built a To3 device was with mica and thermal compound a long time ago.

thanks
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