Picture of RESISTOR



The LEFSON RESISTOR is a very high performance pure silver / carbon audio resistor. It contains a pure graphite resistive element and two pure silver leads. Suitable for speaker crossover or Emitter/Source resistor of transistors in preamplifier/amplifier, the LEFSON RESISTOR is pushing up the limits of sound reproduction.

The three lines PREMIUM, SUPRA and ULTRA allow the user to choose the level of required performance. Near zero inductance and distortion, heat sinkable, mechanical earthing possibility, incredible neutrality, the LEFSON RESISTOR is the ultimate solution to improve any analog circuitry.

Picture of RESISTOR


As all other products of the LEFSON trademark, hand assembly and electric tests are made in our workshop in Northern France. LEFSON-RESISTOR are designed in three lines :

  • PREMIUM : (0R68 -> 200R)

  • SUPRA : (0R68 -> 200R)

  • ULTRA : (0R33 -> 100R)

To achieve optimum results, they need to be burned-in with audio signals for at least 80 hours.





Hundreds of custom ohmic values are available according to following intervals :

MODEL RESISTANCE Pmax * RESISTIVE
ELEMENT
LEADS END CAPS PRICE
DC current Carbon 99,9% Silver 99,9% Silver
- - - - - - -
PREMIUM 0R68 -> 1R5 4/6W SINGLE Ø0.8mm STANDARD 45€
PREMIUM 1R5 -> 24R 6/10W SINGLE Ø0.8mm STANDARD 45€
PREMIUM 24R -> 200R 4/6W SINGLE Ø0.8mm STANDARD 45€
- - - - - - -
SUPRA 0R68 -> 1R5 4/6W SINGLE 2 x Ø0.8mm ENHANCED 65€
SUPRA 1R5 -> 24R 6/10W SINGLE 2 x Ø0.8mm ENHANCED 65€
SUPRA 24R -> 200R 4/6W SINGLE 2 x Ø0.8mm ENHANCED 65€
- - - - - - -
ULTRA 0R33 -> 1R 6/10W DOUBLE 2 x Ø0.8mm
24K GOLD PLATING
ENHANCED 120€
ULTRA 1R -> 15R 8/15W DOUBLE 2 x Ø0.8mm
24K GOLD PLATING
ENHANCED 120€
ULTRA 15R -> 100R 6/10W DOUBLE 2 x Ø0.8mm
24K GOLD PLATING
ENHANCED 120€

Recommended retail price

* Pmax :

The power rating is expressed with two values (example 6/10W). The first one is the maximum allowed power without any heatsink. The second one concerns the maximum allowed power when the LEFSON RESISTOR is fixed on a heatsink or to a reliable case. Regarding this purpose, using thermal paste is recommended.

All these power values were measured with direct current. When AC operating (audio), the maximum allowed power is significantly higher. During our post-manufacturing tests period, the LEFSON RESISTOR is stressed with current peaks, up to 25/30W.