Beaker,
You can get to the lamp from the top. Remove the wood cabinet. Please remember there are 3 screw's. Two screw's on the back part and one at the bottom. Then you have to remove a plast cover over the lamp.
The lamp is an E10 socket - 60 volt lamp.
Good luck!
/Frede
Beolab 5000 - "If another amplifier sounds different then it needs repair!"