I bought one thinking it was functionally equivalent to an AN612 but it's
not, quite.While they're both balanced mixers, the SA612 doesn't seem
intended for audio modulation. What concerns me is that it has no balance
adjustment. I tried it on a prototyping board and it seems happy to modulate
with audio signals. As far as I could measure, the carrier was suppressed
about 30 dB. I'm not sure how much of this I can attribute to the high
capacitances around the prototyping board.
Murray - VK6HL