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Power amplifiers
       M1.2 Reference
description  specs
description  specs
description  specs
description  specs
ML3 Signature
description  specs
     LL2 (regular/deluxe)
     description  specs
     L2 Reference
description  specs
     LP2 (regular/deluxe)
                phono preamp
     description  specs





Rated Output Voltage*


from 20Hz-20KHz:

           1.0 Volts

Voltage Gain


            7.87 + 2% or 17.92 + 0.2dB.

Frequency Response


from 1-30 Volts RMS:

(+ 0dB) 20 Hz, 20 KHz.
(- 3dB) 1.5 Hz, 400 KHz.

Slew Rate


Vout=28.8 Volts peak-to-peak of
square-wave signal, F=10KHz:

41 Volts per microsecond

Rise Time


Vout=28.8 Volts peak-to-peak of
square-wave signal, F=10KHz:

1 microsecond

Total Harmonic Distortion from 20 Hz - 20 KHz


Vout = 2 Volts RMS:

Vout = 30 Volts RMS:

no more than 0.03%

no more than 1%

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


Vout = 2 Volts RMS:

Vout = 30 Volts RMS into IHF load:

no more than 0.03%.

no more than 1%.




gold plated single-ended RCA connectors.

Input Sensitivity*

Vout = 1.0 Volts RMS:

0.127 Volts RMS 2%.   

Input Impedance


50 KOhms + 10%.



gold plated single-ended RCA connectors.

Corrected Output Impedance


typically 250 Ohms.



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

better than 84 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.  


One power transformer, one filter choke, one full-wave vacuum rectifier, one solid-state analog non-switching voltage regulator.

AC voltage intensively filtered by special RFI power line filter.

Front/Rear Panel Controls: 


Front Panel Controls:

  • POWER switch.

  • MUTING switch.

  • LEFT GAIN control.

  • RIGHT GAIN control.

  • SELECTOR switches.

  • MONITOR switch.

  • LED control.

Rear Panel Connectors and Controls:

  • IEC 320 POWER INLET (3 lug).

  • EARTHING POST (gold plated).

  • Four pairs of INPUT CONNECTORS RCA for Line and Tape inputs.

  • Threee pairs of OUTPUT CONNECTORS RCA for Tape, Output 1, and Output 2.



Pure class A vacuum tube design. All stages are single-ended.

High-current drive capability, in combination with unique single-ended class A circuitry, guarantee the preamplifier to drive any cable and any reasonable 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, switchable on the rear panel.


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:

1 Amp slo-blo for 100/120 Volts,
0.5 Amps slo-blo for 220/230/240 Volts



Power Consumption:

Typically 40 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.

(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:

Shipping weight:

20 Lbs (9.1 Kg).  

36 Lbs (16.3 Kg).

Tube Complement:

  • V101 - 12AU7A (left channel, first amplification stage)
  • V103 - 6DJ8 (left channel, second amplification stage)
  • V102 - 12AU7A (right channel, first amplification stage)
  • V104 - 6DJ8 (right channel, second amplification stage)
  • V105 - 6X4/6202 (full wave voltage rectifier)