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  • Re: Beocenter 9300 Timer function

    Brilliant, thank you Guy...
    Posted to Vintage Products (Forum) by Beonix on Tue, Apr 7 2020
  • Beocenter 9300 Timer function

    I am struggling to find User Manual with information on the Timer mode of the BC9300... Can anyone offer any help with this... Tony
    Posted to Vintage Products (Forum) by Beonix on Tue, Apr 7 2020
  • Re: CDX no sound -griplets?

    to be absolutely honest, I simply bridged the relay contacts on the muting relays...
    Posted to The Workbench (Forum) by Beonix on Sun, Oct 13 2019
  • Re: CDX no sound -griplets?

    Hi All... I realise that this is an older thread, but I have just been working on a CDX with exactly the same symptom of no sound output, but everything else working... Having resoldered all griplets on the decoder PCB, still no sound... Turned out to be faulty reed switches (contained within the 'kill' / 'muting' relay)... I will replace with Farnell type 240-9213 glass reed switches... Tony
    Posted to The Workbench (Forum) by Beonix on Fri, Jan 18 2019
  • Re: Marginal RF Instability on Beolab 150

    Hi Martin, thanks for the reply... It did puzzle me a bit, as I had always thought the Zobel network was there to help deal with capacitive loading such as electrostatic speakers... In any event, as the amp was fully dismantled, I have done a full recapping with good quality caps, and I can can see no further sign of instability on my scope, and the quiescent current sets up very stable... I have run the amps for days now and they run luke warm, so hopefully the issue has been fixed... Tony
    Posted to Vintage Products (Forum) by Beonix on Fri, Oct 12 2018
  • Re: Marginal RF Instability on Beolab 150

    Hi Nick, as you suggested, I did a complete recap & trimpot replacement on the Beolab 150s, and discovered that the easiest way to work on them was to desolder all the power devices and remove the PCB... Once I had done that, I could see that the Zobel resistor had burnt out (on both amps), and that 'it' was the real cause of the RF oscillation... Of course, the RF oscillation will itself create excessive power dissipation in the power devices and the Zobel failure may well explain why
    Posted to Vintage Products (Forum) by Beonix on Fri, Oct 12 2018
  • Re: Marginal RF Instability on Beolab 150

    Hi Nick.... thanks for your prompt response... You could very well be right about recapping... I shall make my way down that road... Tony
    Posted to Vintage Products (Forum) by Beonix on Thu, Aug 30 2018
  • Marginal RF Instability on Beolab 150

    Hi all... I have a Beolab 150 amplifier, long overdue for replacement trimmer potentiometers. They have now been replaced, but when I had a look on the scope, I can see RF oscillation at around 2MHz. This instability is marginal, as simply switching an adjacent lamp On or Off can stop or start this oscillation. Unsurprisingly, trying to check the no load current is misleading because it varies by 50mV or so depending upon whether the oscillation is occurring. I have not done any recapping so far
    Posted to Vintage Products (Forum) by Beonix on Thu, Aug 30 2018
  • Re: Beomaster 6000 refurbishment

    Thanks once again Martin... That did indeed fix the problem... As I am the nervous type, I linked P31/3 to P34/3, and P32/3 to P34/2 temporarily, and this restored normal operation on the bench supply... You are right that single sided PCB tracks can easily be broken by pressure on component legs... one to watch for... Thanks again.. Tony
    Posted to Vintage Products (Forum) by Beonix on Fri, Jun 22 2018
  • Beomaster 6000 refurbishment

    I am in the process of refurbishing a BM6000... Amongst other things (such as 7-seg displays etc), I have recapped the Power Supply PCB, remembering to link the two pins of 'C1', and also the Power Amp PCB along with fitting new trimmers for quiescent current and output offset voltage... Rather than risk overheating of the Power Amps, I decided to run up with a Bench Power Supply +/- 50V DC. I have found that the 'no load current' on the left hand amplifier immediately jumps to 21mV
    Posted to Vintage Products (Forum) by Beonix on Fri, Jun 22 2018
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