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  • Re: Restoring a Beomaster 1000

    I have managed to make one of my BM1000's sing again! I have both a black and a white version which I am working on at the same time, although lately my posts was about the troublesome black version. Work on this black one remains to be completed. But the white Beomaster 1000 now produces sound! What I probably need to do on this BM1000 is adjustments. I am still a bit unsure of how (=where) to measure I,J and K (in the schematics). My schematics show the target values and points on the drawing
    Posted to Vintage Products (Forum) by Jeppe on Sun, May 21 2017
  • Re: Restoring a Beomaster 1000

    Martin Oh ***.. The transistors are AC151 and AC153. Can this be the problem.. The specs seem relatively similar but then perhaps not replaceable with AC128's.. AC151 and AC153 will be ordered on ebay. Will report the progress then, will it work..? See the exciting next episode of BM1000 Maniacs!
    Posted to Vintage Products (Forum) by Jeppe on Fri, Apr 28 2017
  • Re: Restoring a Beomaster 1000

    It says on the label on the back: Nr 1000 - Type 2314 Serie 01 P3 No 22124 I do not have a manual for this precise version. I use a manual for 2302-2304. I am a bit unsure about measuring the points J and K actually. I think I figued out point I (the AD149's). The points are marked in the schematics, but then locating an appropriate point on the real board isn't that clear to me. For point J I tried to measure at the AD149V, and I got a reasonable measurement of 32V, this I believe is adjusted
    Posted to Vintage Products (Forum) by Jeppe on Fri, Apr 28 2017
  • Re: Restoring a Beomaster 1000

    Thanks Dillen, I am honored to get your advice. One problem is that the schematics are a mess, I have only one silicon BM1000 schematics version, it is not always corresponding to my machines. In this schematics I see no muting switch. Perhaps there is one in a silicon version schematics I have, but it seems to be a fully mechanical switch. Isn't it unlikely that a mechanical switch would somehow reverse it's operation suddenly. If there is an electronic switch I have yet to locate it. What
    Posted to Vintage Products (Forum) by Jeppe on Thu, Apr 27 2017
  • Re: Restoring a Beomaster 1000

    Thanks for still reading this thread Dillen! What does that mean, the power switch has a muting switch? Today was a step ahead, from no sound at all to a humming noise and some 2 seconds of music after shutting off. That must mean something, is current too high somewhere and the power supply regulation is doing this.. I am thinking about it but can't find an answer yet. I think the AC128's may be weird, again. Those transistors seem hopeless. I measured them before installing, hfe about 76
    Posted to Vintage Products (Forum) by Jeppe on Thu, Apr 27 2017
  • Re: Restoring a Beomaster 1000

    Today I took on the black key germanium BM1000 again. I got new AC128's from ebay, and a bunch of resistors for the power section. Before that it made no sound at all, and I found a shorted AC128 thanks to the Peak analyser. I replaced both AC128's. It was extremely difficult, because there is little space and because the new transistors were smaller than the originals and I tried to use heatsink paste in the heatsink, it was messy. The 5W resistors I ordered earlier was of course too large
    Posted to Vintage Products (Forum) by Jeppe on Thu, Apr 27 2017
  • Re: Restoring a Beomaster 1000

    Hi Jean, It has been a very interesting restoration project, I wish you best of luck. Maybe we can share our problems in this thread? I am continuing with mine. Actually I have two BM1000 that I want to restore, but so far I am working on one. It goes slow because I only do it when I have spare time since this is a hobby. I have another BM1000 which is almost unrestored and working (replaced the three largest caps), it sounds very nice with a pair of closed box speakers, warm and smooth. It is a
    Posted to Vintage Products (Forum) by Jeppe on Tue, Apr 18 2017
  • Re: Restoring a Beomaster 1000

    Thanks Sören. No need to shout though. I am keeping up my attempt with the Beomaster 1000. The learning curve has been steep, I am still a complete amateur but I have learned tremendously. I found a shorted AC128 in the power circuit pair. Thanks to the Peak Atlas DC55. A new pair was delivered today, although I plan to replace only one. But with the rate they fry up now I will maybe need the other one soon too. I also plan to replace all the resistors around them in the power regulation circuit
    Posted to Vintage Products (Forum) by Jeppe on Wed, Apr 12 2017
  • Re: Restoring a Beomaster 1000

    Not sure if anyone has patience or interest to follow my struggle with the Beomaster 1000.. This may develop into the most annoying thread here.. But I have myself learnt alot from similar threads to this one, so I am sure it is not solely for my own profit. Today after some small checks I connected it again. There were lights and there was no smoke! But I had no sound, complete silence. There may possibly have been a short from a broken cable on the bottom side of the board. Then I tried to check
    Posted to Vintage Products (Forum) by Jeppe on Sun, Mar 26 2017
  • Beomaster 1000 health check

    Beomaster 1000 with germanium transistor has problems.
    Posted to Vintage B&O Products (Pre-1980) (MediaGallery) by Jeppe on Fri, Mar 24 2017
    Filed under: Beomaster 1000
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