Sophia Electric™ 12AX7 Tubes -- interchangeable with Telefunken ECC 803S/European ECC 83/US 12AX7
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Sophia Electric™ 12AU7 Tubes -- Interchangeable with Mullard ECC 82/GE 12AU7
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12AX7 Specification
12AU7 Specification
Not all tubes are created equal.
We cherry picked the best tubes from the production for the US market. Our US engineers further tested these selected tubes and classified them into 3 grades:
Pricing:
Grade A (top 10%): $100 per unit with 30 days warranty, $18 extra for one year warranty.
Grade B (top 25%): $80 per unit with 30 days warranty, $18 extra for one year warranty.
Grade C : $59.99 per unit with 30 days warranty, $18 extra for one year warranty.
Factory bulk (unrated): $49.99 per unit with min order of 10 units.
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