BeoGram 400X · Open source part
The plastic tab in the BeoGram 4000 pickup mount can break with wear and age. I replace the mount with my own nylon part and flexible PCB.
The pickup mount on the BeoGram 4000 series holds the pickup in the arm. Its plastic tab can break from wear, stress and age, and once it does the pickup no longer sits securely.
I replace it with a new mount and a flexible PCB, both my own design. The mount is printed by Multi Jet Fusion in PA12 nylon with 40% glass beads, which gives strong layer adhesion, stiffness and accurate dimensions, and it's dyed black to match the original. The flexible PCB is 0.08 mm polyimide with gold plated ENIG traces, so the pickup can be changed many times without wearing them.
It's verified on the 4002 and 4004. Both the mount and the flexible PCB are listed under parts.
Flexible PCB for the replacement pickup mount on the BeoGram 4000, 4002 and 4004. It is made from 0.08 mm polyimide with gold-plated (ENIG) contacts, so the pickup can be changed many times without wearing the contacts. Use it with the Pickup Mount 3D model. Verified on the 4002 and 4004.
This is a 3d model of the pickup mount for BeoGram 4000, 4002, and 4004. It replaces cracked or delaminated originals and features gold-plated contacts and a precise fit. It is suitable for later-style BeoGram 4000 arms with soldered connections. Installation requires soldering and careful alignment.
More work
Relay replacement
The original relays in the BeoGram 4000 series wear out with age. I replace them with my own relay PCBs, built around modern Omron relays.
LED tracking sensor
The BeoGram 4002 tracks the groove with an optical sensor lit by an incandescent bulb that dims with age. I replace it with a calibrated LED on a small PCB.
LED RPM adjustment lights
The bulbs behind the 33 and 45 rpm scales on the BeoGram 4002 and 4004 panel have usually burnt out after more than 40 years. I replace them with a warm white LED PCB of my own design.
Speed testing with SpinDex
Every BeoGram 400X I restore is speed tested with SpinDex, an open source RPM logger I designed for the BeoGram 4000 series.
RIAA preamp
A new RIAA preamp for the BeoGram 4002, built around the OPA2134 in the same form factor as the original board. The second SMD prototype is built and tested.
Sledge motor
The original sledge motors in the BeoGram 4000 series can get noisy and unstable, and their bearings can't be serviced. I replace them with a modern Portescap motor, with a Maxon motor as the alternative.
Restoring the keypad and chassis on a BeoGram 4002
Decades of use wear through the varnish and black paint on the BeoGram 4002 keypad. I strip it, have it professionally painted and refit it to the chassis.
Tell me about your BeoGram 400X and I'll get back to you.