Beam Power Tetrode primarily designed for use in audio frequency power amplifier applications.
Tung-Sol
Tung-Sol - 12AT7 / ECC81
Tung-Sol - 12AU7 / ECC82
Tung-Sol - 12AX7 / ECC83
Tung-Sol - 12AX7 / ECC803S Gold
Tung-Sol - 5881
Tung-Sol - 6550
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