12AX7HJ preamp tubes

Our custom 12AX7HJ preamp tubes (ECC83) offers a well-balanced, colorful and robust tone

Harry Joyce USA achieves the maximum density of the vacuum tube internal distribution of electron flow, compared to other same model vacuum tubes.

In order to improve product texture, the aluminum oxide enriched to ensure that will never change color or fade timeless; each 12AX7HJ tubes  are real gold plated tube pins to further enhance the contact for enhanced performance of the weak signal outside to minimize the loss, giving the most magnificent sound.

Sold as Pair

Filament heating
UH —————– 6.3 (and) 12.6 (string) V
IH ——————- 0.30 0.15 A
Electrode capacitance
No.1 No.2
Input capacitance ———- 1.6 1.6 PF
Output capacitance ———- 0.46 0.34 PF
The cross road capacitance ———- 1.7 1.7 PF
Static parameters
Ua ————– 100 250 V
-Ug ————- 1 2 V
Ia ————— 0.5 1.2 mA
Gm ————– 1.25 1.6 mA / V
u —————- 100 100
ri —————- 80 62.5 KΩ
A1 amplify limits (single transistor)
Anode voltage —————- 330 V
Negative gate voltage ————— 50 V
The gate positive voltage ————– 0 V
————- 1.2 W anode power dissipation
Filament cathode voltage (pk) ——– ± 180 V