NOS Brimar 6057 E83CC CV4004 Yellow T Test V Good Balanced Triode Tube
6057 - ECC83 - 12AX7 - CV4004 - E83CC. Brimar / 6057. NOS BRIMAR. This is a VERY RARE item, British made during the 1960s or earlier. It features a single O-getter, Yellow-T (yellow shield) markings, and black boxy anode plates.