With 2017 underway and the festivities behind us, it’s time to resume the Beocord 9000 restoration. I began by replacing the electrolytic capacitors. As I’ve noted before, these Beocord 9000 units often require minimal recapping, if any. This particular unit seems to have been stored for a considerable period, and I already discovered one faulty capacitor, prompting me to replace the others.

My usual practice is to use audio-grade capacitors in the signal path and opt for high-reliability, 105°C rated, long-lasting capacitors elsewhere. When a capacitor falls outside the signal path and ranges from 1uF to 4.7uF, I often swap the electrolytic capacitor with a WIMA polyester capacitor (MKS). For this recap, I extracted the Beocord circuit boards for a thorough inspection and cleaning. My aim is to closely examine all board connectors and reflow their solder joints. The initial board addressed was the power supply board.

Subsequently, I worked on the rectifier board.

This was followed by the Analog/Digital Converter board.

Next in line was the Record/Playback board.

The Record/Playback board had three 10uF electrolytic capacitors that I opted to retain. They measured a precise 10uF and exhibited a lower ESR compared to the new replacements I had on hand.

As part of my cleaning process, I removed the Mic Amplifier board to clean the switch and plugs while recapping the small board.

On many of these Beocord units, I’ve encountered a sticky green residue on the shield wire of audio cables near the connectors. The image below shows a cable exhibiting this issue connected to the Mic Amplifier board. I thoroughly cleaned the residue and resoldered the shield wire.

Here’s the Mic Amplifier board, now clean and ready for reinstallation.

I anticipate completing the recapping of the remaining Beocord boards tomorrow.