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OWNER'SPAGE

 

Products

Power amplifiers
M1.2 Reference
     description  specs
M2.2
   
description  specs
ML2.2
   
description  specs
ML3 Signature
    
description  specs
Preamplifiers
LL2.1(regular/deluxe)
    description  specs
LL1 Signature
   
description specs
L2 Reference
   
description  specs
LP1 Signature
    
1 description 1 specs
newLP2.1
              (regular/deluxe)
                phono preamp
    1 description   1 specs

Prices

 

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



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  
   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 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.

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


two 6X4, rectifier tubes.

 

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