Hi There   I purchased a set of Koss Esp-9 from E-bay a while ago and have finally got them out of the packing box they went into during a move a while back.   They work reasonably well, though I think I will need to give them a decent renovation to get the most from them.  Before I do I...

Hi All. I recently got hold of some vintage Koss Pro4AA Headphones that I plan to restore. From what I have read, this model is reasonably well rated by their owners. I'm pretty sure that I have one of the earlier models, the origional pads are there, though in need of replacement. There...