Early stereo Pickering/Stanton “Stanton 45×45 Stereo FLUXVALVE”. Series specs: 2 mV per channel at 1 cm/s (specified “per cm/second”), channel separation better than 20 dB, 20–20,000 Hz (±2 dB). Two OEM styli existed: D3707A (2–5 g) and D3707C (3–7 g); both use a 0.7 mil conical diamond in the T-GUARD assembly.