D&R Telephone Hybrid-2, User Manual

Manual page 11  

Current will flow when there is a difference in ground potential between equipment on stage and 
in the P.A. system. Please do check if there is any potential between the housing of the mikes 
and the guitar synth amps, which will be linked by your body on stage. Imagine, a guitar in your 
hand and your lips close to the mike! A ground potential difference of above 10 volts is not 
unusual, in improperly wired buildings it can possibly be as high as 240 volts. Although removing 
the ground wire sometimes cures a system hum, it will create a very hazardous situation for the 
performing musician. 

Always earth all your equipment by the grounding pin in your mains plug.

Hum loops should be only cured by proper wiring and isolation input/output transformers.

 
 
Replace fuses always with the same type and rating after the equipment has been turned off and 
unplugged.  
If the fuse blows again you have an equipment failure, do not use it again and return it to your 
dealer for repair. 
 
And last but not least be careful not to touch a person being shocked as you, yourself could also 
be shocked.  
Once removed from the shock, have someone send for medical help immediately 

 
 
 
Always keep the above mentioned information in mind 
when using electrically powered equipment.