ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
Hello everyone,
A year ago I found a beogram 4002 in bad shape, I got it repaired by a pro, a vintage hifi specialist and he got it working again. But since then there is a sort of vibration noise I can hear as soon as the turntable is plugged in. It appears to come from the transformer, while opening the table I touched it and felt the same vibration as the noise. The transformer is still tightly fixed on the body of the table, it doesn't move at all and does not seem to get hotter after a few hours plugged in. The noise depends on what type of material it stands on it make a lot more noise on a wooden table and lot less when it on metal.
So I wonder, does it mean that the transformer is dying, or will soon be ? If it's not that bad, do you think I can reduce the noise by adding some anti-vibration "feet" on the turntable ? Or some anti-noise thing between the table and the thing it stands on?
Thank you all for your help and advice
Or I'll be happy to buy another transformer to replace mine.The tunrtable is a Beogram 4002 Type 5521
Thks
Where are you located and what is the mains voltage there?
Here in the Netherlands AC power used to be 220V, is now around 230V. Setting humming transformers to 240V sometimes cures these kind of problems, because 230 is sometimes to much for a 220V trafo. Maybe the same applies in your area.
The voltage selector is probably on the back of your turntable. First make sure of the mains voltage, if the setting on your beogram is incorrect unplug turntable and change the selector switch to the right setting.
Hello, I'm in France. And if I believe what I read on Wikipedia the tension is 230 V just like in the Netherlands. May be you're right I'ld like to try your way but I cannot find any voltage selector at the back of the turntable. I can't remember having seen such a thing inside it either. I must have missed it. Anyone knows where it is ?
Jacques
Well…It wasn't exactly on 240 but close. I moved to it closer and the vibration kept on, so I tried to put it on 220V, but now it doesn't vibrates and neither it works… I made a mistake right ? I guess now the PCU at least is dead, isn't it ?
Sorry for the previous message it is so badly written I don't think it's even understandable, so let me try another time : The selector wasn't exactly on 240V but a bit before the mark. I moved it closer and it went a bit further, too much I guessed so I took it back and the vibration kept on, so I tried to put it on 220V, but when I plugged it back it didn't vibrate and neither did it work…
So I guess I made a mistake and now the PCU –at least– is dead, isn't it ?
Those silver contacts get easily corroded. Turn it back and forth a few times (deck unplugged).
However, if you did what you did while the deck was still plugged, you blew the fuse!
Yeah, I think I did. The first time I tried, I unplugged it but when I saw it didn't work I try one more time and I think I stupidly did it while plugged in… Are those fuse hard to find ? Anyway, the voltage selector wasn't the problem because it still vibrated on 240v.
I found on the net someone selling a Beogram 4002 type 5524 PCU, would it work on mine ? It looks the same…Mine is a 5521 and one the diagram I found on the web, it's mentioned that type 5525 is the same. The seller tells me that it should work as they were build the same year… What do you think ?
The fuses are inside the deck. Slide the wooden plinth towards you, then, take the platter out, the alu plate around it will be free to be lifted.
Perhaps the selector was stuck on 220 V and you did not really try 240 V. Did you play the selector as I told you to do?
I meant hard to find as Is it hard to find new ones online. I think I know where those fuses are, under a black plastic box close to the transformer, right?I'll try as you said to move the selector back and forth, may be I add some contact cleaner and see. I was home this morning but now I get back to the office, so I won't be able to try before this evening.And what do you think about the compatibility of that PSU type 5524 instead of 5521 ou 5525 ?
I believe they are the same. But methinks it won't come to that!
And nothing tells you that the new one will be better anyway...
OK, I changed the fuse I blew and doing so I discovered that instead of the two 125 mA fuses I was supposed to have, there was a 125mA and a 250mA. I replaced them by two 125mA just like it's written on the fusebox and on the diagram I found online. Then I set the voltage selector on 240 just like Chartz told me and it still vibrate but I am not sure if I can do better even with another transformer… @Chartz, I believe you're in France and have a 4002, does yours vibrates a little bit too ? When I went to the store where I bought the fuses, the guy said that if I could not set the voltage selector on 230v then the transformer would necessarily vibrate because of the difference between the voltage setting and the actual voltage that is close to 230v. So he proposed to change he transformer for a new one,I think I'll consider it
No my transformer stopped vibrating after the switch over to 240V. It is completely silent.
What the bloke told you is rubbish. And he certainly won't be able to supply a B&O transformer, nor will he be able to find one with the same characteristics for that matter!
An old trick: halve two squash balls and use them as dampers under the beograms feet. Should dampen the buzzing enough. Most of the noise will be amplified noise from the table the beogram stands on. The platter etc are buzz isolated by springs so will not pick up the humming and send it to the amp and loudspeakers anyway.
I agree changing the transformer is doubtful as it will be the same transformer you already have...
Thanks, I'll try the squash ball trick and let you know but still L'll wait to see if I can buy another begrime transformer, I doubt that the squash would be enough and it's a pity not to be able to enjoy this great turnable.
Hi guys,The vibration didn't stop but reduced, so I'll do with it et unplug the turntable each time I don't use it (if not it would drive me crazy). But now I have another thing going on, since I close the deck I had problems with the tonearm… you must think I am dumd and break everything, but I swear I have been very careful I really don't know where that comes from.
Here's what happened, when I first tried to listen a record since I changed the fuses, the tonearm didn't get down on the record low enough the cartridge barley touched the disc. So I checked the tracking force and it was set on 0,5g, and with the MMC20CL cartridge I have it should be about 1g, so I set it right (I though it was that way before but maybe it moved while I was opening the deck?). Now the tonearm goes down right on the disc and plays it very well until a certain point. On every record I tried, at the same point, the tonearm stop going forward and the cartridge jumps just like the disc was broken, you know it jumps a sec backward, go forth and jumps again…
Do you know where that can come from ?