Hello, I finally found my beloved Sennheiser HD424 headphones buried in a box in my basement! Alas, the foam was shot, I thought it would be, but one of the channels is out. I tried swapping the input cord position but it is truly out. Can anyone direct me to reliable source for repair? I'll...

WTB: Good testing 6SN7 JAN CHS Metal Base or Black base Short Bottle with box from the 1940's. I only need one tested tube, should be easier to source than a matched pair. Reasonable offers only. Please provide pictures. PM, welcome. Thanks for looking.