I’m working on restoring a Beogram 4000 turntable, and one of the challenges is finding modern replacements for the large capacitors used in the 1970s. I received a 3D-printed adapter that allows me to neatly install smaller, current-generation capacitors.

These photos show the adapter with the new capacitors in place:

For reliability, I used two 300uF capacitors wired together to replace the original 150uF motor capacitor. The remaining capacitors are high-quality Rubycon, Panasonic, and Multicomp components chosen for their longevity.

********Update: For a closer look at how to assemble the replacement capacitors before soldering, see this link***********

Since this was my first time working on a Beogram 4000, I carefully documented the original wiring before removing anything. Getting the wiring wrong could have been disastrous.

With the wiring diagram as a guide, I removed the old capacitors and installed the new assemblies:

The Beogram 4000 uses a classic Zener diode-based voltage regulator circuit. The main regulating transistor is mounted directly to the metal case for cooling. This photo shows the regulator setup with its Zener diode and the large 3300uF capacitors that act as the system ground:

After double-checking all the connections, I powered up the Beogram, and everything worked perfectly. What a great feeling!