Krell KSA50S conversion 110 to 230 Volts - diyAudio
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Old 8th July 2006, 11:39 AM   #1
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Default Krell KSA50S conversion 110 to 230 Volts

Hi

I have a Krell KSA50S and i need convert the 110 to 230 volt.

In tha amp i have a two switch
SW1=1 Open and 2 open
SW2=2? or 1 and it work on 110V 50HZ(in live in europe and i use a big transformer 230>110)
I don't have a SW3

What is the modification for 230V 50HZ please?

Thanks you
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Old 10th July 2006, 04:39 PM   #2
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new power transformers, i would think.
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Old 10th July 2006, 10:41 PM   #3
AndrewT is offline AndrewT  Scotland
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Hi,
can you identify if you have two 110/120Vac primaries in your transformer?

If twin primaries, it will be easy to convert it to 220/240Vac power even if the switching has not been provided.

If single primary, even multi-tapped, then new transformer.
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Old 15th July 2006, 03:46 PM   #4
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I untied the transformer but I cannot open him because he is sealed.

I see on Transformer a label: 2 X input 110 /120 Volts.
http://img92.imageshack.us/img92/666...sformerjx6.jpg

And i have four cable not used.
http://img89.imageshack.us/img89/261...erinputbx3.jpg
it's good for me?

thanks.
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Old 15th July 2006, 05:55 PM   #5
AndrewT is offline AndrewT  Scotland
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Hi,
if it is wired for 110Vac/120Vac at present then all four primary wires must be connected to the mains input.
two wires to the live (hot) and two wires to the neutral (cold or return).

Can you confirm which colours are connected to the live and which colours to the neutral?
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Old 24th July 2006, 09:46 AM   #6
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Hi
There is several cable how to be sure?
How to verify?

thanks
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Old 24th July 2006, 10:22 AM   #7
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Default Output boards needed

HI
I'm in the proces to put the Krell KSA50 together soon .I have my pc boards from the GB was design by Pink M , I already stuff them .
My question if some one has a set spare output boards he did't used because he used hard wire ect ,
I would be itrested on them.
I want to double the output board because I will use four or more pair transistor per chanel , to spred the heat better on 15inch tall heatsink .
By the way about the transistor
I have MJL21193/94 4pair or more per chanel plastic case.
MJ15003/04 3pair per chanel metal c
MJL1302A/3281A 3 or 4 pair/chanel plas.case
If anyone can give me advise out of his experience wich power transistors I choose .
Thanks to all of you
regards
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Old 24th July 2006, 11:45 AM   #8
AndrewT is offline AndrewT  Scotland
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Hi Gaborbela,
all your output choices will work.
The MJ To3 will need to be hard wired to the output boards.
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Old 25th November 2006, 04:18 PM   #9
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Hello all!

I have new pictures!(is not my camera)

My question: How to convert 120 to 220Volt?


http://img95.imageshack.us/img95/6351/p8220629oa9.jpg
Switch.The modification of the position changes nothing.




http://img329.imageshack.us/img329/6...0619bissg1.jpg

and

http://img138.imageshack.us/img138/6272/amp2rp0.jpg

Voltage



And Cables not used:
http://img95.imageshack.us/img95/673...0624bispt4.jpg


thanks for you help
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Old 26th November 2006, 09:37 AM   #10
AndrewT is offline AndrewT  Scotland
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Hi Cor,
let's start with safety.
Use a mains bulb tester in series with the primary to prevent damage to the transformer if it is wired wrongly.

Now lets look at your diagram with the wire volatges on it.
blk-0, gry-100, or 120. and brn-0, vio 100, wtht-120.

Could you remeasure to check I have it right? The bigger rsistance on each winding will be between blk to gry and from brn to vio.

Connect or and brn.
Connect neutral to white.
Connect blk to live.
Insert the plug top into the outlet of the bul tester.
Switch on.
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