Download a two-page article from RADIO ELECTRONICS, April 1950, on the subject of Phono-EQ design:
DOWNLOAD:PhonoEQdesign1950
These are not phono preamps, so-to-speak; they lack sufficient voltage gain to bring phono-pickup-level up to line level. Nonetheless some interesting info in here which might be useful to those of you DIYing tube EQs out there. An interesting artifact from the era prior to RIAA standardization.
