Posts by rolfzetterberg (archived2)
21 total posts20 results
Restoring a Beomaster 1000
in Imported Content (Unmapped) · Nov 21, 2016 21:23Googling ZF 9,1 tells us it's a 500mW diode.Use a 1,3W. I did a quick calculation of the current through the zener diode and ended at about 8-9mA through the transistor and 10mA through the 1,8k resistor. 18mA in total,w…
Restoring a Beomaster 1000
in Imported Content (Unmapped) · Nov 20, 2016 16:50The 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 g…
Beomaster 4000 radio problem
in Imported Content (Unmapped) · Nov 2, 2016 21:38Such high noise level means that the IF probably is working as it should. I would suspect the tuning voltage.The first thing to check is the 22V stab TR10.
M100 speakers overhaul - what is the second speaker?
in Imported Content (Unmapped) · Oct 26, 2016 13:49Where on Earth did my post yesterday go?? Out into space or? Anyway,new trial. The filler is a Peerless KU45MRF since it has foam surround. There also exists a version with doped surround called KU45MR.
/SOLVED/ Is it a B&O product?
in Imported Content (Unmapped) · Jul 14, 2015 22:30To me they look like ITT Korona: http://www.teenagewasteland.de/technik/bx_itt_kugelboxen.html
Hojttaler Type: SD.... Type: S 607?
in Imported Content (Unmapped) · Nov 18, 2014 10:38I am going to stick my neck out and say that both the alleged B&O own production woofer Kino 160TV and the one in this thread are in reality Seas woofers,although with different magnets. Who proves I'm wrong?
Maybe OT, danish loudspeakers manufactorers
in Imported Content (Unmapped) · Mar 5, 2014 20:15It's not easy to make a complete list since many brands were made in collaboration between Denmark and other countries. The most vivid example is of course Dynaco A25.A mix of Danish manufacture,American money,Norwegian …
Beomaster 1000 Nothing works.
in Imported Content (Unmapped) · Feb 5, 2014 08:32The change to silicon transistors didn't come exactly at the same time as changing the looks. I have a 1000 with the later grey buttons but it has only germanium transistors .
Beomaster 3000-2 Tuner: S (arrow)-Lamps and Stereo Indicator Not working
in Imported Content (Unmapped) · Oct 23, 2013 21:40For some reason I couldn't open your link. Unfortunately my catalogs start with the year 1975,and by then the SFC types were gone and the new smaller SFD types had come. But I found this interesting pdf: http://html.alld…
Beomaster 3000-2 Tuner: S (arrow)-Lamps and Stereo Indicator Not working
in Imported Content (Unmapped) · Oct 22, 2013 21:18Again-what does it say on the filters?
Beomaster 3000-2 Tuner: S (arrow)-Lamps and Stereo Indicator Not working
in Imported Content (Unmapped) · Oct 22, 2013 17:16I presume the filters are Murata.What exactly does it say on the filter and what colour is the dot(if any)?With these data it should be possible to find out both bandwidth and center frequency. In those days it was not p…
Beomaster 3000-2 Tuner: S (arrow)-Lamps and Stereo Indicator Not working
in Imported Content (Unmapped) · Oct 19, 2013 22:44Either that or something is loading down the voltage at the right side of the filter. A filter of this type normally has a loss of around -6dB(half voltage) I would try a new filter.But just for testing almost any old 10…
Beomaster 3000-2 Tuner: S (arrow)-Lamps and Stereo Indicator Not working
in Imported Content (Unmapped) · Oct 18, 2013 21:52No,TR8 is not permanently on.A transistor doesn't know if it's driven by 6 or 7 or 8 volts.It happily functions down to below a few volts.Yes,there are changes in noise,overload margin,gain and so on,but it has no proble…
Beomaster 900K tuner repairs
in Imported Content (Unmapped) · Apr 24, 2013 08:04With a 10,7Mhz IF the AF126 should be OK. Guess what's waiting for repair in my pile of 'when I get the time...'.a 900 with a bad IF transistor!
Beomaster 900K tuner repairs
in Imported Content (Unmapped) · Apr 17, 2013 07:13Must be some kind of misunderstanding here.Aren't we talking IF transistors?
B&O switch
in Imported Content (Unmapped) · Aug 23, 2012 14:37Does anybody know anything about this 5-way video-audio switch? Was it a regular item sold to customers or was it perhaps used by dealers only? (forget the shadows in the pictures.They are only a result of the bad photog…
Beovox 1000 loudspeaker problem
in Imported Content (Unmapped) · Jun 1, 2012 21:47Try the old trick of turning the woofer 180 degr and screw it back again.
Beomaster 901 Mexico
in Imported Content (Unmapped) · Apr 17, 2012 22:33The reason for the "bridge" to the base of 2TR21 is that if the wiper is loosing it's contact with the carbon track,the higher voltage at the upper end of the pot causes the transistor to conduct more,thus clamping the b…
Loudspeaker Type 608
in Imported Content (Unmapped) · Mar 25, 2012 22:19http://agsor.dk/hifi-want.html