S-27 and S-28 had JK/QC Sonar, which was both passive supersonic and active supersonic sonar. QB (supersonic projector) was in production before the war started, but I think they were steered towards new contruction. I'm not sure about NM sonar (depth fiding) on the S-boats, but the S-boats were used as guniea pigs for testing new equipment, so you'd be surprised what some of them had. JP was passive and a late introduction, coming in after SJ radar.
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