Altec Lansing 605B Rebuild In Progress

A new friend on the Klipsch Forums traded me a Altec 605B for a clean Bogen DB20. I've alwasy wanted a classic Altec Coax.

  

Here is the driver that arrived in the mail.

 The paper was not in good shape and definately rotted.  The high frequency driver wasn't working but I managed to fix one of the diaphragm leads. Now some cleaning and a recone kit. How often do these drivers need to be remagnetized??? Really excited about these.