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The Lundahl LL2742-100 is a two-coil choke for tube amplifier anode supplies, offering 42 H inductance at 100 mA in series connection and robust insulation for demanding audio power supply designs.
Lundahl LL2742-100 Choke For Tube Amplifiers 100 mA | 42 H
The Lundahl LL2742-100 is built for tube amplifiers where a stable anode supply choke is required. Its two coils can be connected in series or parallel, giving you flexibility when matching inductance and current capability to the power supply design.
In series connection, the LL2742-100 provides 42 H inductance with a recommended DC current of 100 mA and a saturating current of 140 mA. In parallel connection, it provides 10 H inductance with a recommended DC current of 200 mA and a saturating current of 280 mA. Heat dissipation is 2 W, and the maximum ripple voltage at the recommended DC current is 640 V rms at 100 Hz in series or 320 V rms at 100 Hz in parallel.
The choke uses Lundahl’s standard high internal isolation technique, with isolation foil between each copper layer. The audio C-core is produced in-house by Lundahl, and the winding insulation is specified at 4 kV between windings and 2 kV between windings and core. Each winding has a static resistance of 80 Ω.
The LL2742-100 is suitable for both choke input and capacitor input power supplies, and it can also be connected in series for improved common mode rejection. With a weight of 1.35 kg and M4 mounting holes, it is a substantial component for serious tube amplifier builds and restorations.
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Speakers
Amplifiers
DAC converters
DSP modules
Turntables
Streamers
Woofers
Tweeters
Exciters
Bass shakers
Plate amplifiers
Amplifier modules
Single board computers
Assembled crossovers
Printed Circuit Boards (PCB)
Capacitors
Resistors
Coils
Circuit Breakers
Crossover tools
Screw terminals
Acoustic measurements
Electric measurements
Sound level meters
DIY amplifier kits
DIY component packs
DIY speaker kit
DIY subwoofer kits
DIY bluetooth speaker
DIY electronics kits
Binding posts
Cabinet Hardware
Cables
Connectors
Speaker cabinets
Electromechanics
Power supplies
Speaker repair
Workshop & tools
Amplifier accessories
Stands & mounts
Gift voucher
Books
SALE
