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BeoMaster 3400 Main Transformer rebuild

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Menahem Yachad
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Jerusalem, Israel
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Menahem Yachad posted on Tue, May 15 2012 5:12 PM

My Beomaster 3400 (Type 2802) transformer failed about 4 months ago. All the C-core flat transformers have a nasty reputation for that – they're found in the low-profile Beomasters of the 1970's / 1980's.

Martin Olsen very kindly offered me an original spare part, but when he advised me of the incredibly expensive Danish shipping charges, I decided to look for a rebuild solution. In Tel Aviv, I found a workshop which specializes in rebuilding defective transformers, and when I showed him mine, he said – "I know those – it's from a B&O". I knew that I had come to the right place.

He stripped it completely, and rewound it with thicker copper wire than the original to enable less heat and greater reliability than the original part. His workmanship is superb, to say nothing of being a nice person.

After a week it was ready. I had decided to do away with the multiple AC input windings, as it reduced the price considerably, and approved a single winding for 220-240VAC.

The cost was about the same as for the landed cost of the original part shipped from Denmark, but I decided that once I was going to spend the money, I'd put it towards a real technician who takes pride in his work, as opposed to financing greedy shipping companies.

Here it is installed in my BM3400 – all the voltages are spot on, with almost no recalibration necessary.

Menahem


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valve1
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The south of France and occasionally Dublin Ireland
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valve1 replied on Wed, May 16 2012 6:26 AM

Menahem Yachad:
The cost was about the same as for the landed cost of the original part shipped from Denmark, but I decided that once I was going to spend the money, I'd put it towards a real technician who takes pride in his work, as opposed to financing greedy shipping companies.

"Way to go Menahem ! No carbon kilometers on your transformer and keeping your local expert in a job.

chartz
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Burgundy, France
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chartz replied on Thu, May 17 2012 9:58 PM

I agree. Wow, that Beomaster looks much like the Beomaster 2000. There seems to be completely identical parts!

Jacques

ablaumeise
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Weimar, Germany
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Did you note any change of the transformer "noise"? My Beomaster 2000 with a similiar transformer had a rather annoying and - at lower volumes - distinctly audible humming.

I was never sure if this was due to deterioration of the windings over time or if it was "factory preset"...

Søren Hammer
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Denmark
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What a good job done by a real craftsman. Thumbs up for supporting local business  Smile

ablaumeise:

Did you note any change of the transformer "noise"? My Beomaster 2000 with a similiar transformer had a rather annoying and - at lower volumes - distinctly audible humming.

I was never sure if this was due to deterioration of the windings over time or if it was "factory preset"...

A humming transpormer is quite normal for many B&O models unfortunately.

I have two Beogram 8002's with humming transformers and a Beocord 8004 that is almost too noisy for casual listening.

Vinyl records, cassettes, open reel, valve amplifiers and film photography.

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