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Sayona Woofer Model SHT-1221BT – No Output From All Channels, But Display Present, Now Repaired. | Electronics Repair And Technology News Sayona Woofer Model SHT-1221BT – No Output From All Channels, but display present, now repaired. (adsbygoogle = window.adsbygoogle || []).push({}); My first suspect was the pre-amplifier circuit. It normally runs on 9V supply regulated by a 7809 regulator. (adsbygoogle = window.adsbygoogle || []).push({}); The immediate suspect in this case is the 7809 regulator. So I replaced both. Applied the...