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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

 

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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.

 

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*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.

 

NOTE: we recommend replacing 6C19P and both 12AX3 tubes about once a year 
to maintain the best performance of the preamp

 

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.

NOTE: we recommend replacing 6C19P and both 12AX3 tubes about once a year to maintain the best performance of the preamp

 

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