Do a search on Ebay for "vintage headphones". There are many older
'phones that will do nicely for you. Just try and ensure that they're
functional and that the cotton-covered cords, etc. are not all ratted
out. There are also some imported copies of the old military HS-16 up
for auction from time to time. They work fine and have pin-type plugs
on them. Be careful of them, though. They often go for astronomical
prices due to unknowing persons.

wrote:

I am restoring a Hallicrafter's S-38, and wonder where I might find
the type of headphones that would fit the little double pin inputs on
the back. I have only seen the "jack" style.
Thanks