Here's an oddball part I recently picked up... A 9071A 600 ohm RIAA EQ module.
According to datasheets online, dates to mid 1960s. Matching 9471A line amp had 4x 2n3055s and an autotrans output!
I'd love to find a second one but we all know how that goes...keep me in mind next time you find one!
I have been working with LCR phono EQ but we're using 7k networks which are a lot easier to drive and work out to standard cap values.
Anybody ever try these things out?







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