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Beogram 4500 RIAA

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McGruse
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McGruse posted on Wed, Aug 16 2017 7:17 PM

Hi.

 

I just bought a Beogram 4500 and found out that the DIN socket connections was cut off. Can anyone tell me which color connects to which pin? Can´t find it anywhere on the web. The colours are: blue, white, black, yellow, white (again), red and ground

Also, I suspect that my turntable doesn´t have the built in RIAA that I thought every 4500 had. Could it be like that, and if so can you add it so it will work with my Beomaster 4500?

 

Regards,

Sven

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joeyboygolf
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All Beogram 4500's had the RIAA pre amp fitted. Are you sure that it is not a Beogram 9500 as that looks identical but does not have the pre amp.

You can check that the RIAA is present by opening the deck up (2 screws under the right hand edge, remove the platter first!). The RIAA board is on the right hand side of the chassis.

Personally, I would send it back whence it came from and demand a refund!

Regards Graham

McGruse
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So they were in fact sold without RIAA as an option you mean?

joeyboygolf
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No, someone may have removed or disabled it. I have made that mistake myself. The 4500 I bought had the RIAA disabled by cutting the legs of a couple of caps on the board.

Fortunately, I was able to reconnect the legs and made it work.

Regards Graham

McGruse
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This is what it looks like (flipped 90 degrees)


joeyboygolf
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The pre amp is missing! There are a number of scenarios that could explain the situation. I recommend that you send it back and get a refund.

Regards Graham

Weebyx
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Weebyx replied on Wed, Aug 16 2017 8:00 PM

McGruse:

This is what it looks like (flipped 90 degrees)

It looks like the RIAA is missing and someone have modified the BG4500 to use an external RIAA amplifier. It should be located to the right below the tonearm, just where there are 2 mounting brackets for the PCB.

/Jacob

McGruse
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As I suspected then. Do you have a pic of how it should look? I guess it´s supposed to be attached to the two screwholes on the chassis on the right?

Weebyx
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Weebyx replied on Wed, Aug 16 2017 8:07 PM

McGruse:

As I suspected then. Do you have a pic of how it should look? I guess it´s supposed to be attached to the two screwholes on the chassis on the right?

http://archivedforum.beoworld.org/cfs-filesystemfile.ashx/__key/CommunityServer.Components.PostAttachments/00.00.27.77.22/BG4500.jpg

 

/Jacob

joeyboygolf
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Correct. Sorry, I no longer have any  pictures since I stopped selling.

Regards Graham

McGruse
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Thanks for the quick help guys. Hopefully anyone here has a spare RIAA. I see that the green and white power supply cable is also removed from its socket.

McGruse
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joeyboygolf:

The pre amp is missing! There are a number of scenarios that could explain the situation. I recommend that you send it back and get a refund.

 

I didn´t pay that much and the person I bought it from didn´t have a clue what she sold. She had it together with a Beocenter that looked like a 9500. That could somehow explain it maybe.

Weebyx
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Weebyx replied on Wed, Aug 16 2017 8:35 PM

McGruse:

joeyboygolf:

The pre amp is missing! There are a number of scenarios that could explain the situation. I recommend that you send it back and get a refund.

 

I didn´t pay that much and the person I bought it from didn´t have a clue what she sold. She had it together with a Beocenter that looked like a 9500. That could somehow explain it maybe.

That explains it, BC85/9500 has built in RIAA...

/Jacob

solderon29
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Your Beogram looks to be in good condition,so if you didn't pay much for it,it might be best to hang on to it.

Odd though,if it was used with a Beocentre 9500(integral RIAA pre-amp),I wonder why the plug was removed?

I doubt you will find a Beogram 4500 preamp except via scrap unit nowaday's but never say never.

I do have a picture of one in situe,but can't work out how to load it this site.I'll e.mail it to you.

The Din plug connections by the way are:

Red-Pin 5-rh channel

White-Pin3-lh channel

Screen around the red/white cables goes to pin 2

Yellow pin 6-datalink

Blue-pin 7-not used

Black-goes to the metal case of the connector

n.b the black wire is important,if it's not connected,you will experience a nasty buzzing noise from the case of the Beogram not being grounded

Nick

McGruse
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McGruse replied on Thu, Aug 17 2017 12:43 PM

Thanks Nick.

The player is in fact in excellent condition and it still has the MMC2 fitted on it even though I don´t know the status of it yet.

The plug wasn´t removed, just soldered badly I guess. What about the shield around red and white cables? What pin should they connect to?

I´ve asked the previuos owner to look for the PCB, so I´m crossing my fingers.

/Sven

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