There used to be a large scrap yard not far from where I grew up in South Warwickshire. It had regular lorry loads of government electronic scrap plus some from local USAF bases. On one visit in the late 1960s or early 1970s I found a Hammarlund SP600-JX6 and the boss said “that’s a radio I want £5 for it.”
I found a broken 6C4 valve, replaced it and it worked! It was a fantastic RX and I used it for a few years and then sold it for £60 when I got married.