The SA602, SA612, and NE602 are virtually identical. All of them work in the Beginner's Receiver with equal success.
ON1DHT's 50 MHz Converter
SA612 Integrated-Circuit Double-balanced Mixer
"The QRP-15 CW Transceiver", by Rick Littlefield, K1BQT, CQ Magazine, September 1990, Page 43
"NE602 Primer", by Joseph Carr, Elektor Electronics USA, January 1992
"A Compact 20-Meter CW Transceiver", by Rick Littlefield, K1BQT. Ham Radio, June 1987, Page 8.
"An NE602-Based QRP Transceiver for 20-Meter CW", by Rick Lettlefield, Ham Radio, January 1989, Page 9.
"Simple Receiver From Complex IC's", by Bill Parrott, W6VEH, Ham Radio, November 1988, Page 10.
"NE/SA602 Double Balanced Mixer and Oscillator", Signetics Linear Products Data Book, Page 4-66.
"AN1982 - Applying the Oscillator of the NE602 in Low Power Mixer Applications", Signetics Linear Products Data Book, Page 4-80
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