Stereo TV also coincided with the introduction of Stereo HiFi VCRs. Prior to this, VCR audio was recorded as a mono track and later a linear stereo audio track. However, because the tape speed of a VCR was at or below that of a cassette player, the audio quality was poor. The audio on HiFi VCRs was multiplexed into the video signal and the tape track was helical. This resulted in sound quality that could rival CDs. The trouble, initially, was finding tapes that had been produced with the sound. You could also, in a domestic environment, achieve audio recordings as professional as reel-to-reel tape.
You could also record TV sound in it’s full fidelity which was better than FM radio quality. This was because the Zweikanalton stereo system involved the TV station transmitting two separate signals to achieve stereo. This could be noticed on FM radios that could tune channels 3, 4 and 5 audio signals where, with the introduction of stereo, a second signal (at 1/10th the power) could be received.