Meanwhile, I have been busy working restoring a Bang & Olufsen Beosound Century music centre that I came across on a recycling site recently. I started a thread in the repair section and a link to it is below. It caught my eye as being something that might be possible to flip once repaired on eBay and the proceeds used to fund more TEA acquisitions. It was in a right old sorry state when I first saw it, looked like it been stored in some old barn somewhere, covered in a deep coat of dust and grime everywhere, all over the tape and CD mechanisms. I even wondered if I might be better off taking it straight to the local tip, but the challenge was just too great, and so I set about bringing it back to life.
I should have taken some early photos of it, but I really struggled to get it in a suitable location in my small workshop/lab where I could get some decent shots of it, SWMBO would have done a fit if I took anywhere else because of the state it was in.
I was told that it used to sound really lovely, and it was an expensive bit of kit when new. The owners of it went out and left their teenagers with it and when they returned it was sounding like one of the first ever cheap pocket transistor radios of the 60's era, all treble and nothing else. I cleaned it up and downloaded a service manual for and discovered that it had class G amplifiers and active speakers. That made me fear the worst, that the bass amplifiers would be shot requiring some expensive unobtainable chips etc.
This was further re-enforced when I removed the speaker grills, first the left one revealed a woofer with the cone completely ripped apart and then the right one looked OK. I suspected a blown chip or shorted caps letting DC through to the speakers. I powered it and checked the voltage reaching the woofers (what a horrible sound that was) and discovered that there was only AC reaching the woofers but zero sound from. Voice coils were O/C, so I connected a pair of speakers from another old music centre, and it all worked. Checked the radio, CD and tape decks for functionality and was very pleasantly surprised to discover that literally everything was working, including the recording option of the tape deck.
The service manual gave me no idea as to the impedance of the woofers, but it gives me the frequency response of the speakers, 75 - 20,000Hz. I started looking for replacement drivers and found one on eBay for £50 2nd hand
Long story short, I chose a pair of 8 ohm woofers from CRC that only cost £26.39 delivered and after a bit of fluffing around salvaging gaskets from old drivers, installed them back in the set and powered up, wonderful rich sounds were once again coming from it. Ripping apart one of the old drives, I was able to confirm that indeed the 8 ohm replacements were indeed the correct value after all.
Photos of the speakers and the final completed item can be seen here
https://www.eevblog.com/forum/repair/bang-olufsen-beosound-century-music-centre/new/?topicseen#new So hopefully in the end it should repay my £26.39 many times over when it comes to flipping on the bay of evil, where there are many of these on offer currently in the £250 to £600 brackets, many without the table stand and active FM antenna which this one has, and just the table stands are actually selling for £100 new,
, speaker grills for £65 a pair
, might I be better off stripping it for parts and selling those I wonder?
Either way I should get a handsome return on my investment I'm thinking