Posts by Ninni
53 total posts45 results
Beomaster 1900 capacitors
in BeoMaster · May 29, 2024 19:37Hi Göran. You should not replace tantals with ordinary electrolytics but you can replace them with polyseter film caps. But are you sure you can identify tantals? They're the ones that look like small drops. Plastic cans…
Beocenter 9300 No Life - almost
in BeoCenter · Apr 16, 2024 13:46The 7400 is a quad NAND gate. Connecting three pins together isn't uncommon. You do it when you use one gate as an inverter.
Grounding a Beomaster 1900
in BeoMaster · Apr 7, 2024 18:05Have you tried to connect the ground lead to the central pin (pin 3) on the DIN connector? Or to the DIN connector shield?
Beomaster 8000 right channel is very hot
in BeoMaster · Apr 2, 2024 19:20Does it play, sounding normally, when you switch it on? Is there a trimmer for idle current?
Beomaster 4400 volume control thinks its the balance control
in BeoMaster · Apr 2, 2024 16:11Sounds like the right amplifier has more gain.
BM6500 / 7000 Powerlink - Attenuated Speaker or True Pre-Amp Out?
in BeoMaster · Apr 2, 2024 15:51It's probably to prevent external loads from affecting normal operation of the internal power amp (and speakers connected to it).
Beocenter 3500 issue
in BeoCenter · Mar 31, 2024 17:45So the problem is that it doesn't activate the switch, to start the motor.
Beocenter 3500 issue
in BeoCenter · Mar 29, 2024 20:07A difficulty with this mecanism is that you can't normallly watch it operate, as it's on the underside of the deck. You say nothing happens. Have you tried pressing the button gently and keeping it depressed for a second…
Beomaster 1200 – surprising survivor
in BeoMaster · Mar 29, 2024 19:36I did add a simple FM antenna to get better reception. Just two wires out of the plug. The other bands require another antenna, though.
Beocord 2000 will not play
in BeoCord · Oct 30, 2023 19:12The smallest belt is for detecting that the take-up spool rotates. This is for detecting end-of-tape and turning off the transport when the tape ends. The belt usually drives a rotating magnet and a hall-element (that de…
Beocord 2000 will not play
in BeoCord · Oct 30, 2023 16:01Have you checked that the mechanism belts are OK? This will happen if the drive belt has failed.
Beomaster 1200 – surprising survivor
in BeoMaster · Oct 30, 2023 05:15I was going to restore this Beomaster 1200, which I won at an auction around ten years ago but never got around to take on. Actually, I never even fired it up, until now. Anyway, yesterday I connected it with a 40W light…
Beomaster 3000-2 heavy distortion from right channel
in BeoMaster · Oct 22, 2023 19:32The idle current should be measured by unplugging the supply lead to the power amplifier for the channel to be measured and inserting an ammeter in between. This should read 100 mA, if I recall correctly. There is a warm…
Where to find BD697?
in BeoMaster · Apr 16, 2023 19:14Thanks for the TIP, Glitch. I compared the data sheets and these seem promising and are available at decent prices.
Where to find BD697?
in BeoMaster · Apr 16, 2023 18:24Yes, but which modern transistor is a working equivalent? These are Darlington transistors, if you weren't aware of that.
Where to find BD697?
in BeoMaster · Apr 16, 2023 16:50The output transistors are screwed into an aluminum heatsink, the normal way (see picture). I need replacement transistors to repair this Beomaster. The Beomaster was working normally. I was going to measure the idle cur…
Where to find BD697?
in BeoMaster · Apr 14, 2023 03:05Is there a second source for the BD697 and BD698 that is tested as satisfactory for the Beomaster 901 and Beomaster 1100? It's the output transistors for the power amplifier. When one of them fails, is it mandatory to re…
Beoparts-Shop Beocord Belts
in General Discussion & Questions · Apr 10, 2023 18:27I think different models of belts are made with different kind of rubber and therefore degrade differently. The round belts for the old Beograms seem to last forever, for instance.
4 Ohms Speakers on Beomaster 4500 or Beocenter 9300 Roth Beolink-Active
in BeoMaster · Mar 17, 2023 21:15You shouldn't run the full range signal from the amplifier into the tweeter terminals, unless the loudspeaker has built-in crossover filter for the tweeter. If it has separate connectors for the high and low register, th…
beolab 1700 Voltage and current adjustments
in BeoLab · Mar 17, 2023 20:53Maybe the service manual for the Beomaster 901 can be used? Aren't the amplifier sections identical? I'm currently working on a BM 901, by the way.