BeoGram 400X
The BeoGram 4000, 4002 and 4004 share the same tangential tonearm and sledge design. Fifty years on, the same parts tend to wear out, and almost all of them can be repaired or replaced.
Spec sheet
Common issues
- 01Sticking or failing relays
- 02Burnt-out bulbs in the tracking sensor and RPM adjustment
- 03Worn servo and sledge motors
- 04Aged reservoir capacitors
- 05Broken pickup mounts and worn keypads
01 — Restoration
What I do
Every restoration
Part of every BeoGram 400X I restore.
Relay replacements for the BeoGram 4000 series
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.
Replacing the tracking sensor bulb on the BeoGram 4002
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 replacement for the RPM adjustment bulbs on the BeoGram 4002 and 4004
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.
When needed
Done when a BeoGram 400X needs it.
A new RIAA preamp for the BeoGram 4002
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.
Replacement sledge motor for the BeoGram 4000 series
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.
A new pickup mount for the BeoGram 4000 series
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.
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.
02 — Parts
Open-source parts
The parts I designed for these restorations. The files are open source, so you can build one yourself or improve a design on GitHub.
Siemens Relay Replacement
Sledge Motor Replacement
Light Bulb Tracking Sensor Replacement
RPM Adjustment Bulb Replacement
National Relay Replacement
Pickup Arm Replacement PCB
RIAA Preamp for the BeoGram 4002
Panel Holder
Want your BeoGram 400X restored?
I offer full restorations, from recapping and calibration to custom replacement parts when the originals are gone.