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Rated Output Voltage

from 20Hz-20KHz into 41-KOhm load

            1 Volt RMS.

Voltage Gain

          7.43 ± 2% or 17.43 ± 0.2dB.

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%.

no 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

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

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

better than 87 dB.


better than 90 dB.


better than 97 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.

Front/Rear Panel Controls: 
   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 Panel Controls: 
   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 Signature preamplifier effectively isolates all sensitive electronic components from any induced resonances.

Absolutely outstanding signal-to-noise ratio makes the 
LL1 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.

Dimensions
(preamplifier and power supply have the same dimensions)

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

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-DR / 6H30П-ДР (original), first (single) amplification stage.

          two 6X4, rectifier tubes.