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This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
Hello all.
I recently inherited my grandparents stereo system which consist of a beomaster 1900-2 and a beogram 2200 turntable. They are in a fine condition and I love the aesthetic quality of them. So I thought I would try connecting the beomaster to my external sound card from the headphone jack to get the audio to my monitor speakers.
The system seems to be fully working except for the headphone output. I can only get audio from either the left or the right channel. Not from both at the same time. The left channel works if the plug is correctly inserted all the way through and if inserted only half way through, the right channel is playing.
Its seems there is something wrong with the connection to the 1/4 in. jack. Perhaps there is someone who has confronted the same problem? I guess I could try and open the case and see if there is any bending in the connection to the headphone jack. I haven't got much experience in electronics but I'm ready to give it a try if the procedure isn't overly complicated :)
I'm quite sure that my grandparents never had use for the headphone jack (they didn't have headphones) so I don't think it has to do with wear&tear. Also I'm using a stereo plug (Cordial CFY1,5VPP) for the connection.
Any help would be greatly appriciated.
-Juhani
First of all try to clean the the headphone jack, use a little alcohol (better with Deoxit) on the plug insert it fully and turn it various times, repeat with alcohol a couple of times. If you are connecting to another amp, use the tape out connection.
Collecting Vintage B&O is not a hobby, its a lifestyle.
Have you tested with speakers ?My guess is that only one amplifier channel works. The plug will then pick up the working channel as eitherleft or right depending on how far in you push it and which plug contact ring reaches the working channels contact.A broken balance potentiometer is a very common reason for this behavior - and repairs to the potentiometers are possible.
Martin
Hi Martin.
Unfortunately the original speakers have gone missing and all my speakers are active. But nevertheless I think your theory is correct. I first tried cleaning the connection with electronics cleaning fluid but it didn't help. Then I realized the beomaster has a balance slider. I tried to fiddle with it and it gave a glitching noise when being pulled down although just once. The left channel is active all the way until it reaches the second last line with number 3. Then it switches to the right channel and left one goes silent.
So I guess the tape output wont work either. If it's just replacing a potentiometer I think I could do it myself if there is a circuit diagram, and specs for the potentiometer to be found somewhere. I have the equipment necessary for this. I am also a student so minimizing cost by DIY is always preferred if possible :)
Thank you for your help.
Hi Soeren and thanks for the help.
I will keep this in mind if using another amp .
The solution is to repair the potentiometer(s).
I've made this:http://archivedforum2.beoworld.org/forums/p/11552/100878.aspx#100878
Taking care of the sliding potentiometers does wonders, When I got my beo 1900 only the left channel worked. I took out the pots and cleaned them the brass tracks were complete black and noticed the sliders were broke and weren't holding the brass contacts as they should. I replaced the pot sliders with a kit i bought from dillen. Every thing now works as it should.