From: Karen Lewellen via Talk <talk@lists.gtalug.org>
Still I desired moving from a turntable powered by my receiver to one with its own power source..and bought a Sony.
I don't know of any turntables that are powered by receivers. Maybe I misunderstand you. Traditionally, turntables output a signal that must be "equalized" by the receiver <https://en.wikipedia.org/wiki/RIAA_equalization> This makes phonograph inputs on receivers different from other audio inputs. That isn't a matter of the receiver powering the receiver. Many modern receivers don't have a phonograph inputs. Some phonograph cartridges are "moving coil". Those produce very low power output signals. It used to be that the best way to support those signals was with a dedicated moving coil pre-amplifier. You could get away with a passive transformer (that's what I did). (I don't know if the technology has change in the 40 years that I've been ignoring it.) <https://en.wikipedia.org/wiki/Magnetic_cartridge> Is this where you get the idea of a receiver powering a phonograph?