The “Premium Selected” tubes have passed the following tests: low noise, microphone, gain, sonic, shock, listening, and balanced output.
TAD 12BH7A-STR “Premium Selected” tube (balanced) Excellent tonal quality! First choice for SVT from Ampeq! The new TAD 12BH7A-STR (Noval 9-pin socket) combines the best sonic and mechanical performance of the black NOS RCA board with the advantages of the GE version. The outstanding tonal quality makes it also ideal for Blackstar HT-5 and high-end applications. Defined lows, powerful mids, and bright highs.