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Old 7th March 2013, 06:34 AM   #8451
henryve is offline henryve  South Africa
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Attached is some pics of the amp during my test setup. The bad thing about this layout is that one cannot bias the amp assembled. Spacing is just too tight.

You will notice 2 different sets of capacitors. The smaller ones are 10000uF 63V Epcos Sikorels that feeds the main and driver boards, and the the other ones are 55000uF 63V cheap Indian caps that feeds the output boards. I might replace thos with some Epcos or other caps when the funds allow.

I also need now to clean up an organise the wiring. In future I would prefer Faston connector on the boards for power wiring. I don't trust these screw terminals.
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Old 7th March 2013, 09:45 AM   #8452
HellMan is offline HellMan  Finland
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Absolutely nice work!!

By the way, can anybody tell me how to "split" input so that I can have line out? Just in case I want to chain few of these??
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Old 7th March 2013, 10:18 AM   #8453
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Assuming your pre/source has a decent low impedance output, just a simple daisy chain between in and out connectors should work fine.
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Old 7th March 2013, 11:19 AM   #8454
HellMan is offline HellMan  Finland
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Will try that, thanx!
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Old 7th March 2013, 01:46 PM   #8455
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Nice work!
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Old 15th March 2013, 03:44 PM   #8456
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Default newbie ss builders needs help with start for ksa50 kit.

Hey guys I have been building tubes for 20 years. I finally want to build some class A ss amps. I have built a few chip amps and they sounded bad compared to my tubes. I am building a quad amp horn system and I really want to build a nice but economical class A amp or amps for the bass channels. I have liked the class D's but I have read the phase issues will catch up with me for bass amps. And I want to experience the bass slam of the famous Krell that the audiophiles buy but with out the price of admission. I am not confident that I can source all the parts separately and correctly build a ksa 50 board maybe a much simpler Hiraga which I will definitely build soon but I am told they don't have a lot of bass slam I would want.

I am trying to build a amp to drive reflex bins to keep up with horn top ends to start with. Anyone familiar with this one below. Cheap already stacked all be it with some nasty parts that will need up grading. It says its more then 50 watts I don't understand. I just want a amp board loaded like this with as close to the original 50 watt design as I can find. Can anyone out there get this far through this ramble and direct me to a seller of such a populated amp board set or suggest what this needs to perform as I need? Perhaps a lower voltage supply, supplys. Thanks Guys

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Last edited by fatbattery; 15th March 2013 at 03:47 PM. Reason: spelging
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Old 15th March 2013, 04:27 PM   #8457
tony Ma is offline tony Ma  United States
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@fatbattery, I am in tooo

tired of changing tube....
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Old 15th March 2013, 04:41 PM   #8458
bcmbob is offline bcmbob  United States
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You might want to look at:

Hiraga super 30W class A amplifier kit

High Power Pure Class A amplifier PCB KSA100

High Power Pure Class A amplifier PCB KSA50
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Old 15th March 2013, 04:49 PM   #8459
tony Ma is offline tony Ma  United States
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Is there any BOM for both krell?

What about PS PCB and transformer?

And Chassing maybe???
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Old 15th March 2013, 04:54 PM   #8460
bcmbob is offline bcmbob  United States
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I don't have any info on a BOB but someone else on the thread may. You can send the vendor an email as he might have one.

Also, before you give up on chip based amps check out the MyRef Fremen Edition. The current group buy ended a few days ago but I suspect round 2 quite soon. I'm sure it will meet your quality expectations.
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