Musical Fidelity X-A50 Mono Power Amplifier Clone??

[mark31385]

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

[mark31385]

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

[ljm_ljm]

I give you look at the shape of the original machine.

They each track need a transformer, single power supply.

[olli1324]

Originally Posted by mark31385

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)

[ljm_ljm]

Every piece of circuit board, need a AC 24-0-24, > 100 VA transformer.

[mark31385]

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?

[ljm_ljm]

Originally Posted by mark31385

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.

[mark31385]

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.