Restoring a Beomaster 1000
Most germanium transistors are housed in metal or glass.
They typically die quietly. Only when really pushed they go with a nasty bang.
Martin
Thanks again for your answers🙂
I think indeed the zener diode 908 is bad. The resistors seem ok. AD149-5 seem ok.
I need to buy a new zener. It is labeled ZF 9,1 on the schematics. I believe that is 9,1 volts, but does anyone know what else I need to know, watts?
An odd thing, or if is it me who misread, is that I get the impression that the schematic and the board plan do not completely match. There is a transistor AC126-5 in schematic, but I can't find it on the board plan, it seems this very transistor has become another AC128-3 here. I could of course pull it out to check what it says but I would prefer not to, it sits there so nicely in what I believe is a heatsink? (which I would probably destroy)
I do wonder if they also mislabeled the fried AC128-3's emitter point on the board plan to be B instead of E..? This can be seen in my previous image if you are interested. Did BO make such mistakes? It must be me who is mistaken, but I can't figure this one out, where does the fried AC128-3's E connection go if not just to that point labeled B..
I am so thankful for your advice!
And this is so much fun!
It is the first time I undertake something like this. It is such a lovely machine in how it is built.
Most will know that Beomaster 1000 came in white and grey key versions but it was in fact produced in 12-14 basic versions.
Add to this several build series within each type, more than 30 for some types, and almost all had minor changes and revisions here and there.
I own 145 Beomaster 1000s (apprx 70 different - not counting woodsort variations) and my collection is far from complete, particularly when
it comes to export versions, but I've noticed minor differences even within the same build series and there were also some aftermarket revisions and service-related recommendations, that my or may not have been introduced.
Not everything was well documented and the service manuals are merely covering the basic types.
The included schematics would be the closest-to-correct reference but I wouldn't trust it blindly.
Martin
145 BM's, wow!
The many variations, I see, I had an feeling this would be the case, but that many variations.. Makes the restoration all the more exciting😕
Mine came without speakers. I wonder what speakers they came with, and what speakers would be a good combination for them.. I just bought a pair of Beovox 2702's. Was originally looking for 1702's, but found these, newly restored and in a very good condition, like new. Not necessarily for combining with the BM1000, I was looking also for a BM 1001 and thought it could be a good combination.
May I make a recommendation by the way? I bought these 2702 speakers here:
The reason for the transistor confusion is that they have labeled one transistor wrong on the plan(not in the schematic).
Take a look here,the upper transistor is labeled correctly as AC128-3, but the lower wrongly has got the same number.That transistor should be AC126-5.
I have restored several BMs and never had a drawing that was exactly as the unit, as for the BM 1000 I found 3 different schematics, and non of them were for the one I have here (black keys)
As for speakers, the 2702 will do good, the speakers recommended for the BM 1000 was the Beovox 1000 and the BG was the BG 1000.
I have the BM and the BG 1000 using Beovox 1600 (wall speaker) until I find a pair of Beovox 1000
Location: Mexico city
Printing machine technician
Restored various 1960-70 items
Rock and Roll music
Collecting Vinyl
Restored Jukebox Wurlitzer 1050
This said, I use my BM1000 and my BG1000/SP6 with S45-2 speakers with tremendous results.
Thanks for helping sorting out the transistor confusion. Rolf, that looks just like my plan.
And thanks for your advice for speakers!
This particular BM1000 is perhaps not in mint condition. But it deserves love nevertheless.
The radio scale looks different from what I see on other white key 1000's on the net. Perhaps it's a very late white key version? (it has no model no label)
I haven't figured out how to restore this part. Someone has taped the two parts of the scale, the thin front and the top section, together. There seems to have been some attachments at the corners, which now are broken off. Not sure how this was originally attached.
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It's an exportmodel.
Most units sold in Denmark had the names of danish radiostations printed on the dial, but they
wouldn't make much sense elsewhere so the exportmodels only had frequency and channelnumbers.
Your Beomaster is missing the top half of the front center rail. It's broken off - common problem as the plastic becomes brittle with age.
Beovox 1000 was recommended for Beomaster 1000, though it really deserved better - it's a capable and wonderful sounding amplifier.
Beovox 2702 will be fine. Even larger speakers would also be fine. Beovox 2400, 2600, 3000 etc.
Martin
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