Musical Fidelity X-A50 Mono Power Amplifier Clone?? - diyAudio
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Old 28th October 2011, 01:27 PM   #1
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Smile Musical Fidelity X-A50 Mono Power Amplifier Clone??

Hi Everyone, I've done some searching on the threads but can't find anything relating to this.

I'm interested in building my own solid state amp from a kit (I don't have the experience to design complex circuits yet). I was having a look on EBay and noticed this kit CLONE Musical Fidelity X-A50 Mono Power amplifier board | eBay

Having heard these amps before with the matching pre-amp I was won over but they were out of my price range.

The only questions I have are;

What else would I need, other than a transformer and mounting chassis?
Also where would I source a 150w transformer from, been looking at RS, Maplin and CPC. Would there need to be a circuit design for a power supply?

Any help appreciated thankyou
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Old 28th October 2011, 07:18 PM   #2
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If no one has had any experience with these kits, could someone point me in the direction of a mono block design with a parts list or maybe a stereo amp that you could build with a tag board to start with

I'd like to go down the mono block route though, and not with a crazy 300w per block lol just something like a 50-100w design
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Old 29th October 2011, 12:57 PM   #3
ljm_ljm is offline ljm_ljm  China
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I give you look at the shape of the original machine.

They each track need a transformer, single power supply.
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File Type: jpg mf2.jpg (50.3 KB, 663 views)
File Type: jpg mf9.jpg (55.7 KB, 658 views)
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Old 29th October 2011, 01:51 PM   #4
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Quote:
Originally Posted by mark31385 View Post

Also where would I source a 150w transformer from, been looking at RS, Maplin and CPC. Would there need to be a circuit design for a power supply?

Any help appreciated thankyou
Good source of transformers:
Toroidal Transformers

Info about power supplies:
Elliott Sound Products - The Audio Pages (Main Index)
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Old 29th October 2011, 04:09 PM   #5
ljm_ljm is offline ljm_ljm  China
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Every piece of circuit board, need a AC 24-0-24, > 100 VA transformer.
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Old 29th October 2011, 07:55 PM   #6
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Thank you for the replies, after having a look at the pictures you provided ljm_ljm I think I will give it a try, struggleing to find a 24v-0-24v 100a toroidal transformer though.

LJM_LJM do you have the matching pre-amplifier?
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Old 30th October 2011, 05:41 AM   #7
ljm_ljm is offline ljm_ljm  China
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Quote:
Originally Posted by mark31385 View Post
Thank you for the replies, after having a look at the pictures you provided ljm_ljm I think I will give it a try, struggleing to find a 24v-0-24v 100a toroidal transformer though.

LJM_LJM do you have the matching pre-amplifier?
X-A50 is not need the preamp.

It has a higher voltage gain, about 34.

You can use any audio source directly use.
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Old 30th October 2011, 01:00 PM   #8
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LJM, if you use any audio source directly, then how do you control the volume? Won't it constantly be at maximum? Every pair of X-A50s I have seen all use a pre-amplifier.
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Old 13th November 2012, 05:19 AM   #9
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They sell just pcb's for this amp, does anyone have a schematic or bom ?
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Old 31st December 2012, 12:36 PM   #10
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I got this one. Any comments on the output transistors? MF152N seems not to be a mosfet...
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