JJ Electronic ECC83S 12AX7 High-Gain Vacuum Tube - Closely Balanced B&K 747 Tested
Full Description & History
Genuine JJ Electronic ECC83S/12AX7 high-gain dual-triode vacuum tube suitable for guitar amplifiers, bass amplifiers, hi-fi equipment, stereo systems, microphone preamplifiers, driver stages, and phase-inverter circuits.
This individual tube was bench tested on a B&K Model 747 Dynamic Mutual Conductance Tube Tester. Both triode sections tested at the extreme upper end of the GOOD range. Triode Section 1 measured approximately 115, while Triode Section 2 measured approximately 120. The two sections are closely balanced, with approximately four percent difference between their readings.
The ECC83S is a nine-pin high-mu dual triode electrically equivalent to the 12AX7 and 7025 tube families. This tube is offered as an individually tested replacement for compatible audio and musical-instrument equipment.
Historical Note: The ECC83 is the European designation for the 12AX7, one of the most widely used high-gain preamplifier tubes in audio history. JJ Electronic continued production of this classic tube design for modern guitar amplifiers, professional audio equipment, hi-fi systems, and replacement applications.
Origin Tracker
Bench Stock
Pulled from RF Boneyard bench/service stock for practical repair and restoration use.
Pipeline quantities are informational and may change after arrival, inspection, sorting, testing, or donor teardown.
Compatible Radios / Boards
Compatible Radios / Boards
Compatible with equipment designed for ECC83S, ECC83, 12AX7, 12AX7A, 7025, and equivalent nine-pin high-gain dual-triode vacuum tubes where circuit requirements permit. Common applications include guitar amplifiers, bass amplifiers, hi-fi amplifiers, stereo equipment, tube preamplifiers, microphone preamps, driver stages, and phase-inverter circuits. Buyer should verify the required tube type before installation.
RF Boneyard Bench Notes
RF Boneyard Bench Notes
Tested on a B&K Model 747 Dynamic Mutual Conductance Tube Tester. Triode Section 1 tested at approximately 115 at the extreme upper end of the GOOD range. Triode Section 2 tested at approximately 120 within the upper GOOD range. The two sections are closely balanced with approximately four percent difference between readings. Heater operation confirmed and no shorts indication was observed during testing. Actual test photographs are included.
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