I think you’re taking me literally...off course there were legitimate reasons for the failures as Martin indicated. You start feeling sorry for yourself when it happens and wonder why there were no protections. During that period some amps like phase Lerner, had some protection.

Please don’t take that seriously.

 I’m moving forward with a complete original restoration and getting all that crap out. I was just trying to understand what was accomplished with these modifications.

thanks for your comments.

dj

 

Back in the days, when i was a trainee, at a small electronics plant making inverters (way before the solar boom), we also wound - or coiled - our own transformers (don't know the correct term).

When done, we would put them in an old aluminium milk-jug, maybe a quarter full of lacquer, pull vacuum with an old pump from a fridge, wait an hour, let drip and bake for a few hours till the lacquer had dried up.

You could easily DIY the same with an old humming trafo.

Just my €5.

UPDATE : I see there's a spray called 'Synthite AC-43' especially made for this type of application.

Jesper 

That would be an interesting treatment to try out.  Are you offering to do that for humming transformer owners :-)  ?

-sonavor

Sorry but no I don't. But since it's an easy DIY project, anybody can do it at home. Just forgotten all about it until i read your post. Only thing that triggered my memory was that it's an old trafo, difficult to find and expensive to replace. Sad to see it go in the bin.

Use a glass jar and any vacuum pump. Have a quick search on Youtube on how to do your own vacuum chamber ? 
Or maybe go to your nearest electro shop, who will do the exact same procedure in a little more pro manner 😕

Thanks for the information. If this works as you say it could resurrect a number of Beomaster 4000 transformers.

-sonavor

Sonavor: Do you still have information on BM-4000 PCB designated 8002135?

This PCB has some changes made and I don’t have any information about what it should be.

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Thanks for your response.

Dj

I found a couple of photos in my archive of a Beomaster 4000 without that xxxx2135 board. The components are mounted differently but that circuit is still there. I will look on the schematics to point them out.

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Yes! That’s perfect! Thank you very much. Now I can get rid of the mess without fear.

Hi all:

I have a question about the reservoir caps. I am still cleaning up the mess in this BM4000 and would like to know if I can replace them with 5600uF 80v units?

Can’t find exact match for the originals.

Great! Thanks Martin I don’t know what we’ll do without supportive masters like you.

You were right about the push buttons replacement; it took a lot of patience and more beers than I expected but I finally got it done.