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LAMM LL1.1 Signature Zoom

LAMM LL1.1 Signature

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SKU: LL1.1 Signature
Monaural line level vacuum tube preamplifier with
a separate power supply featuring a full-wave
vacuum rectifier. Class A single-stage low-noise
design. Three inputs, 1 tape loop, attenuator for
gain reduction by 12 dB, single-ended and
pseudo-balanced outputs. Built-in remote on/off
for LAMM amplifiers.

Availability: In stock

$45,390.00
Product Description

    Details

    Untitled 1


    LINE LEVEL TUBE 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 1  1 1  1 1 
    1
    1 1  1 1 1
    1 1 1  1 1 1
    1 1 1  1 1 1
    1 1 1  1 1
    1 1 1 1 1

    The above figures represent LL1 Signature measurements as performed 
    by an independent party,
    Mr. Bascom H. King of BHK Laboratory (bhk@rain.org)

     

    Rated Output Voltage

     

    from 20Hz-20KHz into 41-KOhm load

    1 Volt RMS.

    Voltage Gain

     


    7.43 ± 2% or 17.43 ± 0.2dB.

              Attenuation  

    3.98 ± 2% or 12 ± 0.17dB.

             Absolute Phase  

    Inverting.

    Frequency Response

     


    from 1-50 Volts RMS into 41-KOhm  load


    (-0.1dB) 20 Hz - 20 KHz.
    (-3dB) 5 Hz -140 KHz.

    Slew Rate

     


    Vout=36 Volts peak-to-peak of
    square-wave signal, F=10KHz;
    into 41-KOhm load


    47 Volts per microsecond.

    Rise Time

     


    Vout=36 Volts peak-to-peak of
    square-wave signal, F=10KHz;
    into 41-KOhm load



    0.61 microseconds.

    Total Harmonic Distortion
    from 20 Hz - 20 KHz

     


    Vout=1 Volt RMS into 41-KOhm load

    Vout=50 Volts RMS into 41-KOhm load

    Vout=1 Volt RMS into instrument load
    Vout=50 Volts RMS in to instrument load

    Vout=1 Volt 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%

    no more than 0.03%
    no more than 1%

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

     


    Vout = 1 Volt RMS into 41-KOhm load
    Vout = 10 Volts RMS into 41-KOhm load

    Vout = 1 Volt RMS into instrument load
    Vout = 10 Volts RMS into instrument load

    Vout = 1 Volt RMS into IHF load
    Vout = 10 Volts RMS into IHF load



    no more than 0.09%.
    no more than 1%

    n o more than 0.09%
    no more than 1%

    no more than 0.09%
    no more than 1%

    Inputs

     

    Unbalanced

    gold plated single-ended RCA connectors.

    Input Sensitivity

     
    Vout = 1 Volt RMS into 41-KOhm load

    0.135 Volts RMS ± 2%.  

    Input Impedance

     

     F=1KHz

    Typically 16.5 KOhms.

    Outputs

     
     
    Unbalanced

    Pseudo-balanced
    .
    gold plated single-ended RCA connectors.

    3-pin gold plated XLR connectors.

    Pin assignment:
    pin 1 = signal ground;
    pin 2 = signal output;
    pin 3 = not connected.

    Corrected Output Impedance

     

    F=1KHz

    typically 200 Ohms.

    Noise

     

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

    signal-to-noise ratio, below 2 Volts RMS output, 22Hz - 22KHz

    signal-to-noise ratio, below 2 Volts RMS output, A-weighted



    typically 88 dB.


    typically 96 dB.


    typically 105 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, four filter chokes, one high voltage (350 vdc) high energy power supply, two solid-state analog non-switching voltage regulators.

    AC voltage intensively filtered by special RFI power line filter.

    Power Supply Energy Storage

     



    257 Joules.  

    Front/Rear  
       Preamplifier

     

    Front Panel Controls

    • LED control.
    • OUTPUT LEVEL control.
    • SELECTOR switches.
    • MONITOR switches.
    • ATTENUATOR (-12dB) switch.
    • MUTING switch.
    • OUTPUT 1 switch.
    • OUTPUT 2 switch.

    Rear Panel Connectors and Controls

    • Four INPUT CONNECTORS RCA for line inputs and TAPE (play).
    • One OUTPUT CONNECTOR RCA for TAPE (record).
    • Three OUTPUT CONNECTORS RCA (single-ended outputs).
    • Three gold-plated XLR CONNECTORS (pseudo-balanced outputs).
    • One XLR CONNECTOR (6 pins, gold-plated) for connecting the 
      power supply cable.

    Front/Rear  
       Preamplifier Power Supply

     

    Front Panel Controls

    • POWER switch.
    • OUTLETS switch.
    • REMOTE 1 turn-on/off switch for LAMM power amplifiers.
    • REMOTE 2 turn-on/off switch 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, single-stage zero feedback design, providing the shortest signal path possible. 

    Four low internal impedance (about 800 Ohms per triode!) very linear medium-mu duo triodes are connected in parallel, thus minimizing the internal noise of the preamplifier and ensuring the unprecedentedly low output impedance for this type of topology.

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

    Specially designed damping panel installed in the 
    LL1.1 Signature preamplifier effectively isolates all sensitive electronic components from any induced resonances.

    Absolutely outstanding signal-to-noise ratio makes the 
    LL1.1 Signature one of the quietest line-stage preamplifiers available on the market.

    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.

    Plate voltage overload protection:
    0.3 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,
    internally mounted.

    General

     

    Power Consumption

    Typically 96 Watts.  

    Burn-in Time at Factory

    Minimum 72 hours.

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

    Minimum 80 hours.

    Warm-up time

    Minimum 25 minutes.

    Unit dimensions
    (identical for preamplifier and power supply):

    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


    35.8 Lbs (16.2 Kg).  
    21.2 Lbs (9.6 Kg).

    53.8 Lbs (24.4 Kg).  
    39.2 Lbs (17.8 Kg)

    Tube Complement

              Preamplifier

                   
    Power supply

    .
    four 6N30P-EB / 6H30П-EB, first (single) amplification stage.


    two 6X4, rectifier tubes.

     

    1

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