Great pictures Nat. Those tubes make the things I experimented with years ago look minuscule. By the way, do you remember that the germanium transistors had a low melting point - it was so easy to kill them with the soldering iron before you even applied power and they also had a very low maximum voltage. All in all, it was a good thing that silicon replaced them. Back in the mists of time I was involved with development testing of silicon power diodes. It was an interesting time - how things have changed. We were developing 100A diodes and by the time I left that company, 1000A diodes were being used (early 1970's).