JJ Electronic ECC83S / 12AX7 Closely Balanced Tested Dual-Triode Preamp Vacuum Tube
$21.95
Genuine JJ Electronic ECC83S / 12AX7 high-gain dual-triode preamp vacuum tube tested on a B&K Model 747 Dynamic Mutual Conductance tube tester. Both internal triode sections tested strongly within the GOOD range and measured very closely to one another, making this tube a good candidate for preamp, phase-inverter, audio, radio, and amplifier applications where reasonably balanced sections are desirable. Historical Note: The 12AX7 became one of the most widely used high-gain dual-triode tubes in audio amplification, guitar amplifiers, radios, and test equipment. Its European equivalent, the ECC83, remains one of the most common preamp tube types in modern and vintage tube electronics.
Compatible Radios / Boards
Suitable for equipment designed for ECC83, ECC83S, 12AX7, 12AX7A, 7025, and compatible nine-pin dual-triode preamp tubes when permitted by the equipment manufacturer. Common applications include guitar amplifiers, audio preamplifiers, phase-inverter stages, radios, receivers, test equipment, and vintage electronic equipment. Buyer must verify tube type, heater wiring, operating voltage, circuit requirements, and equipment compatibility before installation.
RF Boneyard Bench Notes
Tested on a B&K Model 747 Dynamic Mutual Conductance tube tester using HT 12, sensitivity 89, and socket 29. Triode Section 1 measured approximately 89 on the tester scale. Triode Section 2 measured approximately 92 on the tester scale. Both sections tested strongly within the GOOD range. Difference between sections is approximately 3 scale points, or about 3%. No shorts indication was observed during testing. Heater illuminated normally. Tube is represented as having closely balanced sections based on B&K 747 relative scale readings, but is not represented as laboratory matched or measured in direct micromhos.
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