B&O Beomaster 2200 40W power amp modules

[sebgreen]

I recently remembered I had pulled the two power amp modules from a B&O Beomaster 2200 which was mainly all smashed up years ago.

They run on +/- 30V and are rated 40WPC.

I suppose the caps will need changing. They have been serviced at some point I think because some of the BJTs are not original. Otherwise do you think it's worth building a supply for these ?

Are they likely to sound any good ?

Cheers

 

[Noise]

If it's worth it, depends on if you need an extra amp, and if you already have the parts available. If you have to buy all necessary parts new, then I would not bother.
You can buy a used "fully functioning" Beomaster 2200 for between 50 and 75 Euro. If you have to buy transformer+bridge+caps+case for this project, it will cost much more.

So it's a matter of what you need/want. Maybe save the heatsinks and built a good chip-amp instead. If you like building amps. Otherwise buy a used amp.

 

[sebgreen]

This is the circuit diagram

 

[sebgreen]

If it's worth it, depends on if you need an extra amp,

I don't need a new amp

Would just be for fun and out of pure curiosity of reviving them.

If they are generally regarded as being of bad design then I definitely wouldnt bother and just keep the heatsinks

 

[Douglas Blake]

Sure why not.
Best case you get a medium good little power amp out of it.
Worst case you get a 30v dual voltage supply for your next project.

If you have a bench supply you could test them with it...

 

[Mark Tillotson]

Odd: the Zobel network is the wrong side of the inductor - although its quite a small inductor.

 

[Douglas Blake]

I've seen them both before and after.

Putting it after the inductor would reduce the load on the network at higher frequencies and it would make a better low pass filter for tweeter protection.