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  • Re: 4004 Tone arm wiring disconnected

    Here is a blog post I made last year of a Beogram 4002 phono cartridge connector replacement. It shows the wiring you are asking about. The Beogram 4004 is the same as the one I show in the photos. -sonavor
    Posted to BeoGram (Forum) by sonavor on Mon, Apr 26 2021
  • Re: 4004 Tone arm wiring disconnected

    What I do is remove the tangential arm assembly from the spindle and rails...then turned it upside down to solder. If you are good with a soldering iron and working from a mirror then doing it in place is possible. I just don't like to risk the hot soldering iron bumping something it shouldn't :-). Go slowly and careful should be fine though. Do you know how those two wires came off? It is very unusual as there is nothing pulling on those wires. -sonavor
    Posted to BeoGram (Forum) by sonavor on Mon, Apr 26 2021
  • Re: Justin's BG4000

    Yes, good work as usual. I like the multi-turn trimmers for no-load current adjustments on amplifiers and for the Beogram speed adjustments. The fine dialing in of the value is really nice. I use single turn trimmers for adjustments that should only need to be set once. -sonavor
    Posted to The Workbench (Forum) by sonavor on Sat, Apr 24 2021
  • Re: BeoMaster 1900-2: strong volume difference on tuner vs phono input ?

    Hi, I have noticed that as well on all of the Beomaster receivers I own. A number of the receivers have preamp source input level trimmers to adjust phono and tape inputs but there are not any adjustments for FM radio sources. Perhaps the FM broadcast these days are at higher levels than when the Beomaster receivers were produced? I don't know. I usually end up adjusting the levels on the phono and tape/aux sources as high as possible and so those about the same. Then I have to remember to lower
    Posted to General Discussion & Questions (Forum) by sonavor on Fri, Apr 16 2021
  • Re: Beogram 4004 problem

    I posted the photos here . -sonavor
    Posted to BeoGram (Forum) by sonavor on Mon, Apr 5 2021
  • Re: Beogram 4004 problem

    I have an update. The M2 nylon washer (that is 1mm thick) does not work. It interferes with the Beogram circuit's ability to keep the solenoid engaged. In testing it I found that the solenoid keep disengaging. I removed the washer and now it works perfectly again. I think I will try out a 0.5mm thick fiber washer (also and M2) and see how that does. However, I am leaning to the solution to this problem being to disassemble the plunger from the brass lever, demagnetizing the plunger and the solenoid
    Posted to BeoGram (Forum) by sonavor on Mon, Apr 5 2021
  • Re: Beogram 4004 problem

    I updated the blog post . The 0.5mm fiber M2 washer also interferes with the solenoid operation by the Beogram 400x circuit. It is best just to demagnetize a problematic arm lowering solenoid then leave the components as they are. -sonavor
    Posted to BeoGram (Forum) by sonavor on Mon, Apr 5 2021
  • Re: Beogram 4004 problem

    I did as Martin suggested and added a small washer (nylon M2) to the end of the plunger that makes contact with the sleeve. That should prevent the problem from coming back. Having restored a lot of Beogram 400x turntables and owning quite a few myself I don't think this is a widespread problem. I think it warranted the B&O service bulletin that Martin mentioned but it isn't something every Beogram 400x turntable has. The one I fixed is the first one I noticed an issue on. However, now
    Posted to BeoGram (Forum) by sonavor on Wed, Mar 31 2021
  • Re: THE BEOWORLD SPRING 2021 PRIZE DRAW !!!

    [quote user="chartz"] Merci, c’est un tres beau cadeau n’est-ce pas ? [/quote] I just logged on and saw your big win Jacques. What a fantastic prize! Congratulations and enjoy it. -John
    Posted to General Discussion & Questions (Forum) by sonavor on Wed, Mar 31 2021
  • Re: Beogram 4004 problem

    It seems like the best solution is to solve demagnetizing the solenoid. Either through the method you used or figuring out a way to disassemble the solenoid. For the latter it appears that the metal bar that actuates the lever for the arm lowering damper would have to be bent straight so it could be removed (after also removing the lock washer). I have a solenoid right now that appears to have this magnetization issue. It was kind of sticking when it tries to engage...I could feel it resist moving
    Posted to BeoGram (Forum) by sonavor on Mon, Mar 29 2021
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