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  • Re: BM4400 new Darlingtons sound different and cold?

    I have one of these https://youtu.be/9sbfdtYDPCM Its mostly very accurate, for the right applications...never tried darlingtons before on it.. So it identfies them as regular NPN or PNP tranistors with a hfe of 24-50 (!) quite uneaven between the units...and ofcourse i was expecting more like 1000 and forward voltage between 900-1100mV so atleast that sounds normal?
    Posted to The Workbench (Forum) by Garten on Sun, Dec 22 2019
  • Re: BM4400 new Darlingtons sound different and cold?

    ...so the old lady is back sounding like before.... Here are the new TIP's upclose.... realy bizzare if they are fake, or just "new".. but i guess I just proved that they absolutely made a difference. Thanks all for the help, as the saying goes, if it ain't broke don't fix it!
    Posted to The Workbench (Forum) by Garten on Sat, Dec 21 2019
  • Re: BM4400 new Darlingtons sound different and cold?

    ...so the old lady is back sounding like before.... Here are the new TIP's upclose.... realy bizzare if they are fake, or just "new".. but i guess I just proved that they absolutely made a difference. Thanks all for the help, as the saying goes, if it ain't broke don't fix it!
    Posted to The Workbench (Forum) by Garten on Sat, Dec 21 2019
  • Re: BM4400 new Darlingtons sound different and cold?

    Here they come, new TIP147 and TIP142 in situ and the old bunch
    Posted to The Workbench (Forum) by Garten on Sat, Dec 21 2019
  • Re: BM4400 new Darlingtons sound different and cold?

    I feel pretty safe they are correct and good caps, I recaped it myself using a kit from Martin in 2016! :=) And it has sounded beutiful eversince.. i actually think som of that adventure is here i the forums somewhere... steep learningcurve. No... the change in sound came came a few weks ago when i fixed the cracked PCB and changed out all the Darlingtons. I noticed a crack in the ceramic coating in one of the emitter resistors, so perhaps change them out and also replcae the trimpots for 25 turn
    Posted to The Workbench (Forum) by Garten on Sat, Dec 21 2019
  • Re: BM4400 new Darlingtons sound different and cold?

    Yepp on the tops, just like Beolover :=) https://beolover.blogspot.com/2015/05/beomaster-4400-full-recap-and-output-trimmer-replacement.html Everything works, and works wonderfully.. it just sounds incredibly dull and not at all like before.. Is it in my head or shall i realy try switching back...? I can't find any scientific facts on Darlingtons needing burn in or sounding differently after 30years etc.. etc..
    Posted to The Workbench (Forum) by Garten on Fri, Dec 20 2019
  • Re: BM4400 new Darlingtons sound different and cold?

    Yupp 5,8 mV or there abouts across top of output resistor pairs, just like before, stable
    Posted to The Workbench (Forum) by Garten on Thu, Dec 19 2019
  • BM4400 new Darlingtons sound different and cold?

    Hi all, I had a cracked PCB exactly where craig had his ( https://forum.beoworld.org/forums/t/22490.aspx ) And the weirdness of the artifacts before i read his adventure and found it made me think there was issues with the output darligtons in my left channel, as that was the only explanation i could find. So i decided to change them all out, they were an old mishmash of originals and replacement BDV series from old repairs anyways, smeared paste all over... So I got myself new Tip147's and TIP142's
    Posted to The Workbench (Forum) by Garten on Thu, Dec 19 2019
  • Re: Beovox RL140 same serial nr, but differences within?

    Thanks Martin, a bit strange but aslong as it have not effect on sound. I do think it was not there originally, the stickers on the back with serial etc indicate it is the original rear piece, and there is absolutely no sign of any glue, melting or any trace of anything ever been mounted on the one lacking plates. In anycase, thanks! My big trouble is getting the foamglue here through the mail while we still have several degrees below zero in Sweden, and the glue is not supposed to freeze or it will
    Posted to Vintage Products (Forum) by Garten on Sat, Mar 24 2018
  • Beovox RL140 same serial nr, but differences within?

    Hi all, I have acquired a pair of very old RL140's and opened them up for a refoam job, but then something strange caught my eye, the insides of the rear frame looked different in this matched pair (same single owner since the 80:ies and same serial nr, an early one 3372001 model 6501) One has these metal plates afixed with glue, and the otehr rear frame lacks them completely. Any ideas, a Danish worker just forgot to mount them on this one speaker? Or What kind of implications would you think
    Posted to Vintage Products (Forum) by Garten on Sat, Mar 24 2018
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