[95bcwh]

All,
  I've bought a Moscode 401 amp at RMAF. I'm an absolutely newbie when it comes to tubes. I have two questions, if you know the answer please kindly help me out here:

#1 How do I know when to replace the tube?

#2 If one of the tube suddenly breaks when while listening, will that damage the amp?

Thanks
barry

[95bcwh]

Grant, Thank you a gain!

Is there a way to check whether a new tube is good or defected before we insert it?