JJ Electronic 12BH7-A Preamplifying Tube
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JJE-12BH7-A
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The JJ Electronic 12BH7-A is a medium-gain dual triode vacuum tube with low noise and rugged build, ideal for preamp, driver, or phase inverter stages in guitar amps and Hi-Fi gear. It offers clean headroom, reliability, and smooth, detailed sound.
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JJ Electronic 12BH7-A Preamplifying Tube
The JJ Electronic 12BH7-A is a medium-gain dual triode vacuum tube with low noise and rugged build, ideal for preamp, driver, or phase inverter stages in guitar amps and Hi-Fi gear. It offers clean headroom, reliability, and smooth, detailed sound.
High-Quality Dual-Triode Tube
The JJ Electronic 12BH7-A is a high-quality dual-triode tube designed for exceptional performance in a variety of audio applications. Known for its balanced tone, robust build, and dynamic response, this tube is perfect for audiophiles and musicians seeking superior sound quality. Whether used in hi-fi amplifiers or as a driver tube in guitar amps, the JJ 12BH7-A delivers clarity, warmth, and dependability. It’s pin-compatible with other 12BH7s. This is good where you need more headroom / cleaner sound than you’d get from using a 12AX7 (which has more gain but also more distortion/noise), but still want tube character.
JJ Electronic
JJ Electronic is a world-renowned manufacturer of vacuum tubes, electrolytic capacitors and high-end audio amplifiers. Founded in 1993 by Jan Jurco, a small garage business grew to become a well known and respected in music industry. JJ vacuum tubes and capacitors are widely used in guitar and audio amplifiers, recording studio equipment and in a variety of applications for audiophiles.
Key Features:
- Balanced, Clear Tone: Smooth highs, rich mids, and tight, defined lows for a versatile sound profile
- Dual-Triode Design: Delivers dynamic and articulate performance in preamp and driver circuits
- Versatile Applications: Ideal for hi-fi audio systems, guitar amplifiers, and studio gear
- Durable Construction: Engineered with JJ’s signature rugged design for long-lasting reliability
- Exceptional Dynamics: Provides excellent touch sensitivity and note separation for precise audio reproduction
Specifications:
- Gain (µ): ~ 16.5 — moderate gain, more than many power triodes but less than high-gain preamp tubes like 12AX7
- Filament (heater) Voltage: 6.3V (when used singly) or 12.6 V (when tied for heater circuits that share resources)
- Filament Current: 600 mA / 300 mA depending on the heater wiring (6.3V or 12.6V setup)
- Plate (anode) Voltage: Typical operation around 250 V, with max up to 300V
- Plate Dissipation: Up to ~3.5 W, meaning that’s the max power the plate can safely dissipate
- Internal Resistance (ri): ~5.3 kΩ
- Transconductance (gm): ~ 3.1 mA/V (how much output current changes for a given change in input voltage)
- Physical size: Noval envelope, somewhat compact. Dimensions like ~20-22 mm diameter; height ~50-57 mm depending on source
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