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This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022

 

Beogram 5000 tonearm transplant

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Saint Beogrowler
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Saint Beogrowler Posted: Wed, Apr 6 2016 10:30 PM
I have two Beogram 5000 that had their tonearms destroyed due to poor packing during shipping. Got myself a tonearm off eBay, wires intact. Question is:

Which cartridge pin wire is which?

.

Saint Beogrowler
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Continuity test shows which is ground. So 1 known.

I opened up my RX2 tested continuity. If looking at the tonearm as a baseball diamond; home plate showed L,LG continuity. 1st R,RG. 2nd L,LG. 3rd R,RG. So that was partly helpful.

My guess is 2nd base is L. 1st R. 3rd RG. Home plate as LG. I can't find any validation or know if connecting LG to L etc will damage anything.

Søren Mexico
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Here goes

 

Collecting Vintage B&O is not a hobby, its a lifestyle.

Saint Beogrowler
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Thank you Søren! No wonder I couldn't find it mentioned online, it's in every beogram service manual.
Saint Beogrowler
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Transplant mostly successful! Maybe a new belt is needed and still a little bit of scraping noise but 3 piles of broken turntable parts are now a functional BG5000.
Saint Beogrowler
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Low cost speed adjustment. Not a professional tool by any means and it made me dizzy but helps makes a turntable listenable. Also, I'm not connected to the developers or anything related to this app.

I was measuring 31rpm before and now 33....rpm. Much more listenable, my belt was not the problem. Easier than adjusting speed by ear.

sonavor
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sonavor replied on Thu, Apr 7 2016 7:00 PM

An interesting and clever tool but I'm not sure I want the weight of the phone on the platter. As for the cost...it only seems low cost if you have already spent all the money on the phone and service Smile.

Good find though and thanks for sharing the information.

-sonavor

Søren Mexico
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I use a strobe disc, http://www.vinylengine.com/strobe-discs.shtml

Use it with and incandescent lamp, I never checked the accuracy but sounds good to me

Collecting Vintage B&O is not a hobby, its a lifestyle.

sonavor
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sonavor replied on Thu, Apr 7 2016 8:14 PM

I now use this tool - BeoloverRPM. It is specifically for Beogram 400x and 800x turntables but that is what I need it for. If I make a flat disk with the same markings as one of those Beogram platters I could probably use it on a different type of turntable.

-sonavor

 

Saint Beogrowler
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Both of those seem more likely to not induce a sense of nausea in their applied use. But the app does have spontaneous portability, useful for house parties and hipster wedding receptions.
sonavor
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sonavor replied on Thu, Apr 7 2016 9:30 PM

I agree, if one has a phone that can run the app then it is a very handy tool for a quick check of a turntable's speed problem. In my case though, I wanted as accurate a tool as I could get for my workbench. The ability to record results over a long burn-in test was important for my use. 

-sonavor

Saint Beogrowler
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This tool definitely lacks precision. There would be a predictable variation in speed depending on the phone's location on the player during rotation. Unbalanced weight. Like where there is extra chain lumped on a tractor's tire when pushing show, lurching.

My next bench tool will probably be an ESR meter and then a scope. I think component troubleshooting is more fun then mechanical troubleshooting at this time.
sonavor
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sonavor replied on Thu, Apr 7 2016 10:03 PM

An ATLAS ESR meter and Transistor/Diode meter from these guys were early workbench tools I picked up. I like them a lot. An oscilloscope is also an excellent tool to pick up. I started with an Owon digital scope first, then decided to add an old Tektronix analog scope just to have for comparison. Since then I have added a USB to PC scope and a USB to PC audio spectrum analyzer from these guys. It is like wood working or auto mechanics, once you start some projects you end up buying more and more tools to make the job easier. The Owon digital scope and the QA400 Audio Analyzer are my most used measurement devices.

-sonavor

Saint Beogrowler
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Thanks for the diagnostic tool recommendations!

This is a tool I use all too often because the person before me lacked a decent Philips screwdriver, good hand tools are so beautiful.

Dremel timeWink , but this does not relate to the BG5000 anymore.
sonavor
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sonavor replied on Thu, Apr 7 2016 10:32 PM

Watch this video, even Axel Schürholz uses a Dremel tool when he restores/builds MMC cartridges. Dremel tools are a must have for sure.

-sonavor

Saint Beogrowler
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Woah. That's super cool. Such steady hands. Thanks for sharing that video.
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