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
hi all i am new here.
i have just brought a beomaster 4000 and after using it for a while there is a hum from the transformer.
is there anyone who can repair this?
many thanks.
justin
Repair, no. Replacement, yes. Unfortunately those original transformers are constructed in a manner that makes a repair on them impossible.A modern transformer is not readily available either because of the low profile it must be for the Beomaster cabinet. Beoworld member, beolover, did a replacement of one back in 2016 by having a custom toroid type transformer made. The result was great but the cost of the transformer may be more than one would like to spend. Here is another link to that replacement transformer.
-sonavor
Hi Justin,
I carried out a transformer replacement on a Beomaster 4000 last year.
This post describes the process:
https://archivedforum2.beoworld.org/forums/p/35343/275029.aspx#275029
I had a toroidal transformer custom made to specification. It cost about GBP 100 but it was worth it for the silence. It would be possible to get a toroid made up for less; I probably overspecified.
It is do-able, but you will need to make up a metal support tray as the existing box can't be modified.
Beolover 3d printed his support tray. His transformer was far more expensive than mine because he specified the multiple primary taps that are necessary to preserve the voltage selector function.
I opted for a single primary to enable operation at 240 VAC only and did away with the voltage select function.
Hope this helps; these are very fine devices and well worth preserving.
Simon
Hi many thanks for your help on this I would love to do this but I don't think I am that good at doing this type of thing if I new what wire to put were I could do it but I would no what wire to put were on the transformer.
Would you be willing to do it again. Or help me order the right one. And show me what hose were.
Many thanks Justin
Krolroger: Hi Justin, I carried out a transformer replacement on a Beomaster 4000 last year. This post describes the process: https://archivedforum2.beoworld.org/forums/p/35343/275029.aspx#275029 I had a toroidal transformer custom made to specification. It cost about GBP 100 but it was worth it for the silence. It would be possible to get a toroid made up for less; I probably overspecified. It is do-able, but you will need to make up a metal support tray as the existing box can't be modified. Beolover 3d printed his support tray. His transformer was far more expensive than mine because he specified the multiple primary taps that are necessary to preserve the voltage selector function. I opted for a single primary to enable operation at 240 VAC only and did away with the voltage select function. Hope this helps; these are very fine devices and well worth preserving. Simon
Ah, right. Sorry I forgot you did that repair. Going with a fixed voltage to lower the cost of the transformer is a nice solution. B&O did that with a number of its audio components in the 80's (i.e. Beomaster 8000, Beogram 800x). That BM4000 project is a good reference. I will remember that next time the subject comes up :-).
One of the problems with the Beomaster 3000 and 4000 sets is that in money terms, despite the wishful thinking of numerous ebay sellers, it makes no economic sense to pay somebody to fix a major problem like a buzzy transformer, not that I am qualified to do that anyway.
So, the only realistic restoration option for most enthusiasts is the DIY approach
Having said that, a transformer transplant is definitely not the place to start especially if you don't know how to identify what wire goes to where.
But gaining some experience by changing capacitors, trimmers, lamps and learning how to carry out a number of simple service operations, all of which your set will need, is a good place to start. You will need some basic tools, a service manual (downloadable from this site if you are a Silver member) and a methodical approach. Maybe after that you will have gained sufficient knowledge to tackle the transformer.
There are many knowledgeable people on this board who have given me help and encouragement over a few years, and I am sure they will help you too if you ask your questions clearly.
You can get a service kit from Dillen (Martin) on this board. It will have everything you need.
Good luck,