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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
LL1.1 Signature
   
1 description 1 specs
L2 Reference
   
description  specs
LP1 Signature
    
1 description 1 specs
LP2.1 (regular/deluxe)
                phono preamp
    1 description   1 specs

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LINE LEVEL TUBE PREAMPLIFIER

 

Rated Output Voltage*

 

from 20Hz-20KHz:

      
           1.0 Volts
RMS.
      

Voltage Gain

 


            7.87 + 2% or 17.92 + 0.2dB.

Attenuation

 
            5.62 ± 10% or 15 ± 0.85dB.

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%.

Inputs

 


Single-ended 


gold plated single-ended RCA connectors.

Input Sensitivity*

 
  Vout = 1.0 Volts RMS:

0.127 Volts RMS ± 2%.   

Input Impedance

 
 
50 KOhms + 10%.

Outputs

 
 Single-ended
gold plated single-ended RCA connectors.

Corrected Output Impedance

 

typically 250 Ohms.

Noise

 

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

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



better than 84 dB.


better than 94 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, 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.
  • REMOTE switch.
  • MUTING switch.
  • LEFT GAIN control.
  • RIGHT GAIN control.
  • ATTENUATOR (-15 dB) switch.
  • SELECTOR switches.
  • MONITOR switch.
  • LED control.

Rear Panel Connectors and Controls:

  • IEC 320 POWER INLET (3 lug).
  • EARTHING POST (gold plated).
  • REMOTE CONTROL plug.
  • Four pairs of INPUT CONNECTORS RCA for Line and Tape inputs.
  • Three pairs of OUTPUT CONNECTORS RCA for Tape, Output 1, and Output 2.

Features

 



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, internally switchable.


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.

AC voltage fuses:

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

General

 

Power Consumption:

Typically 40 Watts.  

Burn-in Time at Factory:

Minimum 72 hours.

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

Minimum 50 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:

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)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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