Sophia Electric 12AX7 Tubes: Interchangeable with Telefunken ECC 803S/European ECC83
The Sophia Electric 12AX7 offers the best high-frequency extension and resolution on the market.
Pricing:
Grade A (top 10%) : $125 per unit with 30 days warranty, $29.99 extra for one year warranty.
Grade B (top 25%) : $100 per unit with 30 days warranty, $29.99 extra for one year warranty.
Grade C : $79.99 per unit with 30 days warranty.