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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.

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:

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