There is so much interesting material in this catalog. I wish you could have read it and then talked about highlights or synopsize some of the descriptions. It could be so much better with some informative narration.
FYI I subscribed to Audio Amateur forever back in the ???1980s and read an article I think by Erno Borbely about using your own tubes in preamp design. I custom designed a line stage using UY-227 tubes with 6SN7 cathode follower output/buffers and really started to get into the old stuff. His choice of preamp tubes wound up being the 01-A. The best sounding 227s are Champion by far, not the blue glass Arcturus A I may have hoped.
