High Performance Stereo
(0 item) - $0.00

You have no items in your shopping cart.

LAMM L2-L2.1 – Reference Zoom

LAMM L2-L2.1 – Reference

Be the first to review this product

SKU: L2-L2.1 – Reference
Model L2 Reference represents top of the line in LAMM hybrid and solid-state audio equipment. It is one of the best creations of its designer's professional career--a result of years of intensive research directed at attaining the most accurate reproduction of recorded music. Unique topology and application of the most advanced technological resources and processes bring the L2 near the threshold of excellence in sound reproduction. A main distinction of the L2 from any other comparable type of preamplifiers is its almost inaudible sonic signature. When connected to an appropriate type of power amplifiers, and especially LAMM amplifiers, it assures the extraordinary transparency of perceived sound and recreation of a three-dimensional soundstage in the home, recording studio, etc., without boundaries and limitations.

The L2 features a topology that brings out the most natural sound performance in the audio path, as well as graceful and sophisticated design. Its unique circuitry utilizing specially selected super-linear high voltage MOS-FET transistors ensures a class A operation from input to output, with no overall feedback at any stage. All stages, including high current output buffers, are single-ended. A unique electronic protection circuit enables manual muting of the outputs until the preamplifier has stabilized after a turn-on; it also enables functioning of the preamplifier in a "muting" mode during operation and automatic switching to muting in case the AC line voltage drops or is interrupted. Other features include 3 inputs; 1 tape loop; output signal phase switch; balanced and single-ended outputs; and built-in remote on/off for LAMM power amplifiers.

The L2 has a separate power supply that utilizes a choke contained filter, vacuum tube rectifier and voltage regulator.

Special care was taken in designing a high voltage (+350V) high speed vacuum tube voltage regulator. Using this voltage regulator, in conjunction with other technical aspects, enables the reproduction of tiniest nuances and three-dimensional subtleties in the music palette (provided that such details had not been lost in a recording process). A somewhat unusual combination of high voltage vacuum tube power supply and superlinear high voltage MOS-FETs allows to attain an enormously large output swing while retaining practically constant harmonic contents of the signal with an absolute dominance of the second harmonic.

In designing the L2 special attention was directed toward optimization of the output impedance of the preamplifier with an aim of attaining practically full independence of the output impedance from frequency, as well as to allow the preamplifier to drive (without audible sonic degradation) significant capacitive loads created by many modern interconnect cables.

Each preamplifier is carefully hand-crafted with matched components of the highest quality, some of which include military graded low noise DALE metal film resistors; unique TKD stepped potentiometers (41 detents); PRC wire wound resistors; ELECTROCUBE and ROEDERSTEIN film capacitors; high frequency switching grade CORNELL DUBILIER electrolytic capacitors; specially selected long life vacuum tubes; high quality heavy duty gold-plated RCA connectors; and gold-plated NEUTRIC XLR connectors. The preamplifier power supply features a custom-designed super-low noise toroidal power transformer. AC voltage is filtered by special RFI power line filter.

Summing up the above, we take the liberty in stating that we have been able to create a preamplifier with practically no sonic signature, of course, taking into consideration the fundamental limitations inherent in reproduction of live music by electronic means.

The L2 works on all world AC line voltages (100/120/220/230/240V).

Availability: In stock

$19,690.00
Product Description

    Details

    Untitled 2

    HYBRID LINE LEVEL PREAMPLIFIER

     

    Instrument load:  the load consisting of 91 KOhm resistor and 200 pF
                                    capacitor connected in parallel.
    IHF load:               the load consisting of 10 KOhm resistor and 1000 pF
                                    capacitor connected in parallel.

     

    1

    *The measurements of rated output voltage, voltage gain, and input sensitivity 
    were taken at the balanced output. 
    The rest of the measurements were taken at the single-ended output.

     

    Rated Output Voltage*

     


    from 20Hz-20KHz into instrument load:

    from 20Hz-20KHz into IHF load:

    0.75 Volts RMS.

    0.75 Volts RMS.

    Voltage Gain*

     



    5.54 + 2% or 14.87 + 0.2dB.

    Frequency Response

     


    from 1-60 Volts RMS into instrument load:

    from 1-30 Volts RMS into IHF load:


    (-0.2dB) 20 Hz, 20 KHz.
    (-3dB) 5 Hz, 140 KHz.

    (-0.2dB) 20 Hz, 20 KHz.
    (-3dB) 5 Hz, 120 KHz.

    Slew Rate

     


    Vout=36 Volts peak-to-peak of
    square-wave signal, F=10KHz:


    30 Volts per microsecond

    Rise Time

     


    Vout=36 Volts peak-to-peak of
    square-wave signal, F=10KHz:


    1 microsecond

    Total Harmonic Distortion from 20 Hz - 20 KHz

     


    Vout = 2 Volts RMS into instrument load:
    Vout = 60 Volts RMS into instrument load:

    Vout = 2 Volts RMS into IHF load:
    Vout = 30 Volts RMS into IHF load:


    no more than 0.03%
    no more than 1%

    no more than 0.03%
    no more than 1%

    IM Distortion 
    (60Hz:7KHz  4:1) SMPTE:

     


    Vout = 2 Volts RMS into instrument load:
    Vout = 60 Volts RMS into instrument load:

    Vout = 2 Volts RMS into IHF load:
    Vout = 30 Volts RMS into IHF load:


    no more than 0.03%.
    no more than 1%

    no more than 0.03%.
    no more than 1%.

     

    Inputs

     


    Unbalanced


    gold plated single-ended RCA connector.

    Input Sensitivity*

     

                 
    Vout = 0.75 Volts RMS into instrument load:

    Vout = 0.75 Volts RMS into IHF load:


    0.135 Volts RMS ± 2%.  

    0.135 Volts RMS ± 2%.  

    Input Impedance

     
     


    51 KOhms.

    Outputs

     

     
    Unbalanced:

    Balanced:


    gold plated single-ended RCA connectors.

    3-pin gold plated XLR connectors

    Pin assignment:

    pin 1 = signal ground;
    pin 2 = non-inverting input (+);
    pin 3 = inverting input (-).

    Corrected Output Impedance

     
     


    typically 130 Ohms.

    Noise

     

     
    signal-to-noise ratio, below 2 Volts RMS output, unweighted


    better than 82 dB.

    Operating Temperature

     

     


    -4 to +104 degrees Fahrenheit 
    (-20 to +40 degrees Celsius) ambient.

    Power Supply

     


    nominal line voltage:

    Input voltage range:


    100-240 Volts, 50/60Hz.  

    ±10%.

    One power transformer, two vacuum tube rectifiers, one filter choke, one high-speed vacuum tube voltage regulator, one solid-state analog non-switching voltage regulator.

    AC voltage intensively filtered by special RFI power line filter.

    Front/Rear Panel Controls: 
       Preamplifier

     

    Front Panel Controls:

    • OUTPUT LEVEL controls (separate for left and right channels).
    • SELECTOR switches (separate for left and right channels).
    • MONITOR switches (separate for left and right channels).
    • MUTING switch.
    • ABSOLUTE PHASE switch.

     

    Rear Panel Connectors and Controls:

    • Four pairs of INPUT CONNECTORS RCA for line inputs and tape (play).
    • One pair of OUTPUT CONNECTORS RCA for tape (record)
    • One pair of OUTPUT CONNECTORS RCA (single-ended output).
    • One pair of gold-plated XLR CONNECTORS (balanced output).
    • One XLR CONNECTOR (6 pins, gold-plated) for connecting the power supply cable.

     

    Front/Rear Panel Controls: 
       Preamplifier Power Supply

     

    Front Panel Controls:

    • POWER switch.
    • OUTLETS switch.
    • REMOTE 1 turn-on/off switches for LAMM power amplifiers.
    • REMOTE 2 turn-on/off switches for LAMM power amplifiers.
    • Four LED controls.

    Rear Panel Connectors and Controls:

    • IEC 320 POWER INLET (3 lug).
    • Two AC OUTLETS, switched.
    • One XLR CONNECTOR (6 pins, gold-plated) for connecting the power supply cable.
    • Two REMOTE CONTROL plugs.
    • EARTHING POST (gold plated). 

    Features

     
     


    Pure class A fully balanced MOS-FET zero feedback design. Power supply utilizes vacuum tube rectifier, choke contained filter and high speed vacuum tube voltage regulator.

    High-current drive capability, in combination with unique single-ended class A circuitry, guarantee the preamplifier to drive any cable and any connected real world load,while maintaining its practically inaudible sonic signature.

    This design is unique to LAMM INDUSTRIES, INC.

    AC voltage selector:

    100/120/220/230/240 Volts, internally switchable.


    Remote Control:


    Special built-in circuit enables the remote turn on/off of LAMM power amplifiers.

    Available remote link cable coordinates the remote functions of two or more amplifiers.


    Safety:


    Unique electronic protection circuit enables muting of the outputs until the preamplifier is stabilized after a turn-on, as well as functioning of the preamplifier in a "muting" mode during operation and automatic switching to muting in case the AC line drops or is interrupted.

    Vacuum tube voltage regulator overload protection:
    0.125 Amps slo-blo fuse, internally mounted.

    AC voltage fuses:
    2 Amps slo-blo for 100/120 Volts
    1 Amp slo-blo for 220/230/240 Volts

    General

     


    Power Consumption:


    Typically 95 Watts.  


    Burn-in Time at Factory:

    Minimum 72 hours.

    Recommended Burn-in Time in End-user's System:

    Minimum 200 hours.

    Warm-up time:

    Minimum 45 minutes.

    Unit dimensions
    (preamplifier and power supply have the same dimensions):

    Crate dimensions:

    4.5 inches high x 19 inches wide x 13.875 deep + 1.375 inches for front handles.


    23" x 19" x 10" (58.42cm x 48.26cm x 25.4cm)

    Unit weight
         preamplifier:
         power supply:

    Shipping weight
         preamplifier:
         power supply:


    15.42 Lbs (7 Kg).
    19 Lbs (8.63 Kg).

    34.6 Lbs (15.7 Kg).
    39 Lbs (17.71 Kg)

    Tube Complement:

    • one 12AX7/ECC83, voltage regulator tube;
    • one 6C19P, voltage regulator tube;
    • one 5651A, voltage reference tube
    • two 12AX3, rectifier tubes.


    1

Additional Information

    Additional Information

    Call For Price N/A
CMS tab