I just received a BG4002 AC from South Africa, for restoration. It appears to never have been worked on, in excellent all-round condition.

Here is the challenge for those with SHARP eyes. 

It is NOT a standard BG4002 AC, by any means.

This is a very unusual piece, with 2 components which are hardly ever seen in the BG4002/4 or BG6000.

I probably worked on one of these special units as a young apprentice B&O tech, over 40 years ago, but since I started CondorAudio in 1998, I have never seen this specific special version.

Who can identify these special ingredients?

Menahem Yachad wrote:

Who can identify these special ingredients?

It is a DC version and has a CD4/RIAA pcb?

Opto reader on the threaded shaft.
Leads soldered to main board rather than plugged.
Carriage position switches rather than an opto ruler.

Martin

Martin

I should have excluded you! There's not much which you haven't seen.

No, it's not a DC version - the large AC motor and the big 4 caps are clearly visible.

 

So what's so special about this unit?

It was one of the very first BG4002's ever made, immediately after the BG4000 stopped production. 

There were some components left over from the BG4000 production.

One of the most common leftover BG4000 parts which were transferred to the 4002 production was the 4000 platter, which has the strobe markings underneath for the neon lamp (abolished on the BG4002)..

 

But on this unit, there is also the BG4000's Carriage position switches and associated PCB, instead of the later perspex opto-ruler.

As soon as I noticed that, I automatically looked for bits and pieces of the 4000's red indicator slider.......

And of course, as Martin also identified - the lamp on the threaded shaft whose associated circuit counts the revolutions of the plastic wheel.

So this unit is actually a hybrid BG4000/4002.

 

What over-engineering!

It all disappeared shortly afterwards, on the first full BG4002 production (no more BG4000 leftovers)..

 

I love working on these machines - a real pleasure!

 

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Hi Guys!

I am a bit of an electronics virgin. Am working on a beolab 4000 with a spot of foam related damage...... Login to view image

fkatze wrote:

So this has been a while in the works...a few delays here and there...being stuck in another country, etc etc.

 

But I finally put an order in for a new board and keypad for my beocord 8000 to be printed on a commercial printer using better material than I can do.  Found a place with a more reasonable price, and if the test order works out, I hope I'll be able to offer a plastics kit for the BM2000 for anyone interested.  I should receive the test parts in about a month.

Here's hoping.

How do you people deal with this kind of scrathes and wear outs? Paint, sanding, acid or something else? Tips?

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Menahem Yachad wrote:

And of course, as Martin also identified - the lamp on the threaded shaft whose associated circuit counts the revolutions of the plastic wheel.

It doesn't actually count. Its output is sensed and filtered for fast pulses and (in some versions) held up against the carriage position to determine when the needle runs in the lead-out groove.

Martin 

Orava wrote:

How do you people deal with this kind of scrathes and wear outs? Paint, sanding, acid or something else? Tips?

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I use a silver cleaner product called Argentil. No idea if that’s available abroad. Silvo perhaps?

 

Magic eraser, perhaps, for the superficial dark marks.
if the scratches are deep, the answer is you don't deal with it, instead replace the damaged parts.

Martin