I was trying to find out a little bit about the amplifier I bought today, and of course, somewhere on the internet are a bunch of knowledgeable geeks discussing the very thing:
- AR Stereo Amplifier/Universal - Classic Speaker Pages
- AR Amp Bias - Classic Speaker Pages
- AR amplifier: headphones, Delrama - Classic Speaker Pages
The last link there was particularly interesting. It notes that the company who made these amplifiers - AR Inc. - started manufacturing products in Amersfoort in 1969, which I guess is the origin of the one I bought today - this matches the broader manufacturing timeline which is validated by the presense of the headphone jack on the one I purchased, making this amp a full 45 years old.