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Has anyone really gone to town on a BM 5000 overhaul like this chap called Yachadm in Israel ??
I keep looking at my 5000 and 5500 and think it would be a really good idea to change/upgrade a lot of the components and get another 30 years out of my two receivers :-)
Location: London UK
Menahem is one of the best and his "instructions" looks great doesn't it! Send him a mail...or maybe he reads this thread!
Has anyone really gone to town on a BM 5000 overhaul like this chap called Yachadm in Israel ??
Yep, done several versions from BM5000's till BM7000's and many other beautiful vintage from B&O.
But so does other's. Look at the workbench section, and you'll get an impression who does.
Location: Utrecht
Yes I'm working through a 5000 system (CD, Cassette, Turntable) for a friend, and have the Power Amp/Tuner nearly finished at the moment.
I'm not convinced that the trimmers need replacing, and have checked all the electrolytic capacitors with an ESR meter. Most were reading more than 30 ohms and have been replaced, with the exception of the 22mfd 16v non-polarised brown ones, they measure fine (<1ohm) and have been left in situ. The ribbon cable for the front panel was broken and had a heavy ribbon cable soldered over it which also had broken. These have been replaced with one flexible small ribbon. The heatsink has been removed, all transistors and insulators cleaned and re-pasted and is back together.
The output relay has also had its contacts cleaned although I really should have replaced it with new, after all it's in series with decent speaker cable so we should give the signal a fighting chance of ending up at the speaker! I will monitor performance and change the relay if it plays up.
The major problem I have is the cord threading and associated spring which seems to have been elongated and jumps off the pulley when the panel is pushed in. I'd like to find the correct threading diagram or a photo but cannot find it anywhere, you think it would be in the service manual. Can anyone help with a photo?
One problem I've encountered is on the power supply/amplifier board PCB 2. The original dried out capacitors C100, C200 were clearly marked 470mf 16v, however the parts list shows they should be 100mf 63v, and looking at the schematic they are decoupling 39.5v and so should not be 16v. The parts list would appear to be right, so watch out for this.
One problem I've encountered is on the power supply/amplifier board PCB 2. The original dried out capacitors C100, C200 were clearly marked 470mf 16v, however the parts list shows they should be 100mf 63v, and looking at the schematic they are decoupling 39.5v and so should not be 16v. The parts list would appear to be right, so watch out for this.
Does anyone know if there is a similar guide for the CD50?
Look for the thread "Beogram CD50 Mexico" and "belt change" by Søren.
Thanks, Jacques. If I can't figure it out myself, I will take it to Atlantic Systems here in Mass. I've found B&O equipment is really not for the inexperienced. I've had some success with minor issues only. I have a recap kit and mute relat from Dillen that I will use on my spare BM5000 shortly. No ambitious mods, just refurb.Look for the thread "Beogram CD50 Mexico" and "belt change" by Søren. Jacques
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