...in the early days because I was an idiot ;(
In the summer of '86, I acquired my first Thorens TD124 equipped with the above tonearm at an estate auction for $1!!! I kept and used the turntable but the plastic cover of the counterweight was cracked so I replaced it with a Sumiko MMT. I eventually sold this tonearm for $10. I didn't know what an Ortofon SMG212 was then.
I purchased a box lot of tubes and parts for $5 at a hamfest which contained one of these. Later that day, I accepted a $15 offer for the transformer. I've been looking for another one since...
Found one at a flea market for two bucks and flipped it at a hamfest for $20. I didn't know it was an Altec 3000B, the phenolic horn looked too cheesy.