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The Lundahl LL1517 is a line output transformer for tube amplifiers, designed for balanced or unbalanced drive with excellent bandwidth, high output balance and robust isolation.
Lundahl LL1517 Line Output Transformer for Tube Amplifiers
The Lundahl LL1517 is built as an audio output transformer for tube amplifiers and supports both balanced and unbalanced drive configurations. Its 1 + 1 : 1 + 1 winding arrangement makes it suitable for line output stages where flexible primary and secondary connection options are required.
Internally, the transformer uses two three-section coils, with the primary and secondary windings separated by electrostatic shields. This construction is combined with Lundahl’s own audio C-core and a mu-metal housing, giving this audio component a carefully controlled magnetic and shielding structure for demanding audio circuits.
The LL1517 delivers a wide frequency response of 10 Hz to 80 kHz within ±0.3 dB when used with a 10 Ω source and 600 Ω load. With the secondaries in series and a 600 Ω load, it reaches a maximum output level of +24 dBU at 30 Hz before saturation. In a mixed feedback drive circuit, distortion is below 0.03% at 20 dBU and 30 Hz.
Practical specifications include 47 x 34 x 18 mm dimensions above the PCB, 5.08 mm pin spacing, 35.56 mm row spacing and a weight of 105 g. The recommended PCB hole diameter is 1.5 mm. Primary-to-secondary isolation is rated at 4 kV, with 2 kV isolation between windings and core.
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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
New products
