Roederstein was in fact very good quality components when new.
Unfortunately, they don't age well. The black ones in particular.
Martin
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What Are You Working On Now
1309 replies
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Please erase Martin.
The fun continues. New holder for the slide control board. Printing as I type this. I made a happy discovery about the left hand slide cover - it is basically the same as the right hand one, but just a little bit shorter, and the mounting holes in a slightly different position (and only 2 instead of 3).
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Just fitted it up - first thing I don't have to do a second time! Pretty happy with it, but I might have used PETG and a higher infill ratio. Not to matter. I will change over to PETG and I'll redo everything then.
Really enjoying the CAD snippets and seeing more 3DP here! PETG is a great material, maybe the best when in need of easy printing and decent mechanical strength.
Location: San Francisco
I'm an automotive audio and acoustic engineer. I design loudspeakers and full sound systems for new automobiles. I also dabble with studio, consumer and pro audio projects from time to time.
I have a lot of free time these days because of the lockdown. I fixed my beogram 4000, and today it was the turn of the beomaster 1200 which had been waiting for a revision for too long. It is an intact, complete and original sample. Even the power plug is the original equipment one. It worked, but with many defects (hum, noisy switches, noisy potentiometers, an intermittent channel).
Once opened I was able to notice the dirt accumulated in 50 years and the components still all original. I proceeded to recap the amplification board and the preamplifier board, which was also carefully cleaned. The potentiometers were also cleaned and treated with flux.
<a href="https://ibb.co/spTdbNR"><img src="https://i.ibb.co/kVLs5wB/DSC-4246.jpg" alt="DSC-4246" border="0"></a>
<a href="https://ibb.co/hC4WbBm"><img src="https://i.ibb.co/R7s0f3D/DSC-4251.jpg" alt="DSC-4251" border="0"></a>
<a href="https://ibb.co/zm6sMsG"><img src="https://i.ibb.co/nwPrGrz/DSC-4272.jpg" alt="DSC-4272" border="0"></a>
<a href="https://ibb.co/tD1HJVh"><img src="https://i.ibb.co/kXPGSNy/DSC-4274.jpg" alt="DSC-4274" border="0"></a>
<a href="https://ibb.co/SQZVxSJ"><img src="https://i.ibb.co/CJSVtLW/DSC-4275.jpg" alt="DSC-4275" border="0"></a>
<a href="https://ibb.co/mDMDLfS"><img src="https://i.ibb.co/8KSKW1X/DSC-4277.jpg" alt="DSC-4277" border="0"></a>
Main capacitors are now 2x2200uF (original 1x3000uF) and output capacitors are 4700uF/25V (original 3000/25V). That's what I had, but I think they will do their job. Many original capacitors were way out of spec, but no one was shorted. Fitted new low ESR electrolytics.
Checked transistor idle voltage and regulated supply voltage as per manual. Everything fine. Cleaned everything and reassembled.
In my opinion one of the most iconic and beautiful B&O products ever made, now in all its glory.
I have a lot of free time these days because of the lockdown. I fixed my beogram 4000, and today it was the turn of the beomaster 1200 which had been waiting for a revision for too long. It is an intact, complete and original sample. Even the power plug is the original equipment one. It worked, but with many defects (hum, noisy switches, noisy potentiometers, an intermittent channel).
Once opened I was able to notice the dirt accumulated in 50 years and the components still all original. I proceeded to recap the amplification board and the preamplifier board, which was also carefully cleaned. The potentiometers were also cleaned and treated with flux.
Main capacitors are now 2x2200uF (original 1x3000uF) and output capacitors are 4700uF/25V (original 3000/25V). That's what I had, but I think they will do their job. Many original capacitors were way out of spec, but no one was shorted. Fitted new low ESR electrolytics.
Checked transistor idle voltage and regulated supply voltage as per manual. Everything fine. Cleaned everything and reassembled.
In my opinion one of the most iconic and beautiful B&O products ever made, now in all its glory.
Something a little different for me...……..
Something a little different for me...……..
That would make a great B&O repair shed 🙂
Something different for me too. Still overseas due to virus etc. Working on a couple of old Walkman style players on kitchen bench. This last one was a fair challenge, bought inop, now working happily. I even got it to record. Couple more in the pipeline, and also a Technics SU-Z36, which looks in good nick. I managed to get a bunch of supplies for my B&O projects for when I finally get back home.
Wonder how many of these I have allready done. Sonewhere between 10, 20?
Usual problems and silent RIAA, broken supply tr. More or less siezed tapedeck, lack of use. And it was all pieces as previous owner has started to "fix" machine. Not complety mint, but everything works.
I got hold of an RDS module for my 2-way BC2300 and have just fitted it. It came mounted to the tuner board so I now have one of those spare if anyone wants it (should fit BC2300 or BC2500)
Photos of fitting:
Location: Warwickshire, UK
My B&O Icons:
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