Your oldest gear?

@willywonka  I tried too get a pair of Koss electrostatic headphones repaired a year or two ago- called the company- they no longer service the headphones. 

I also had a pair of Koss headphones I bought in the 70's- don't quite recall the model number. Unfortunately, I have no idea whatever happened to them. 

The 70's Koss headphones that imparted a splitting headache after a few minutes of wear? I had a pair of those... I think everyone did. Ouch... the top of my head hurts just thinking about them. 

@ghdprentice no- not those. Mine were light open backed and a pleasure to wear 

The Koss head crusher.
 

I think the most affordable, nicest sounding, but most uncomfortable Koss headphones were the 1970’s PRO 4AA’s.
 

As l say, they sounded brilliant, and they completely isolated you from the outside world. Closed cup and heavy, and had outer ear crushing leather pads. It was okay for the first side of a record, but after that your ears started hurting and sweating. When you took them off your outer ears felt as flat as pan cakes.

Had the Koss PRO 4AAs and yes they were very uncomfortable. The AKG K240 was much more comfortable and better sounding IMHO. My oldest piece is a NAD 4150 Tuner, quite a disappointment after owning the superb NAD 3140 integrated amp.  Not sure why I kept the tuner all these years. I also kept my Kyocera A-710 integrated amp and still use it in a second system.  It sounds great to this day.