9
REPLACING THE TUBES
For the design of the MAX-800 we have chosen an especial tube model, this gives to
the MAX-800 its special sound characteristic.
When you need to replace the vacuum tubes use allways original EDAX tubes.
All vacuum tubes have a limited life due to reduced electron emission
from the oxide coating on the cathode and/or a buildup of impurity gases is the bulb.
Due to the hi quality of the tubes in the MAX-800 the life is estimated to be
several years.
we recommend changing the 8 tubes at once.
If you are uncomfortable with replacing he tubes yourself, please have
It done by qualified service personnel.
1) Unplug the MAX-800 and wait at least 30 minutes for the high voltage in the unit
to discharge and for the tubes to cool to room temperature.
2) Only remove the top cover by removing the two #8-32 Allem-head screws.
It is not necesary to remove the bottom cover.
3) Note the position of the eight tubes (V1-V8) in the porcelain sockets
4) Remove each tube and replace with the new one.
5) Reinstall the top cover and screws.
If you notice the sound quality deteriorating - higher distortion, muddiness,
or microphonic behavior - it's time to change the tubes.
Allways
The vacuum tubes become very hot once the unit has been turned on, and they should
not be touched until they have cooled to room temperature.
When should you replace the vacuum tubes?
You should only replace the vacuum tubes in the preamplifier when you start to notice a change
in the sound quality. This is usually evident when the tone becomes "dull", and transients seem to
be blunted.
