During playback, Hi-Fi audio may temporarily revert to normal audio when you adjust tracking. This is normal.
When connecting the VCR to a stereo TV, you will only get stereo sound if you use audio cables to connect the AUDIO OUT jacks on the VCR to the AUDIO IN jacks on your TV. Make sure the TV is in Line (Auxiliary) Input mode.
When you connect the AUDIO OUT jacks on the VCR to the AUDIO IN jacks on your TV, the stereo light on the TV might not glow. But, as long as the VCR status display indicates you are receiving a stereo signal, you are receiving a stereo signal. This is normal.
Only tapes recorded in Hi-Fi audio will play back in Hi-Fi audio. Tapes recorded in normal audio will play back in monaural (single sound source) audio.