I had a C7 in the late 70's. I liked the sound with the GE tubes! If you can afford it either NOS Mullard's or Telefunken's would be the ne plus ultra choice! Beware of fakes!
The C7 was my favorite phono stage from 1978 to 1983. I stupidly sold it when I needed some fast cash. At the time I also had the much-esteemed PS Audio III phono stage. As good as that was I much preferred the C7! In fact, the C7 first appeared as the phono stage in the Precision Fidelity C2 preamp. Bruce Moore was the designer. He also designed the earlier Paragon tube preamps - the 10 and 12. So you have a true classic in the C7!
The C7 does not have a high-level stage. It is phono-only! The volume control and source selector function passively with no gain for high-level sources (tuner, CD player, tape deck ...). I preferred using my C7 strictly as a phono stage into the high-level inputs of the various SS preamps I bought and sold over time.
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