Rated Output Voltage*

F = 1KHz:
MM input to output
MC input to output

             0.125 Volts RMS.
             0.125 Volts RMS.

Voltage Gain*

F = 1KHz:
MM input to output
MC input to output

            75.5 + 2% or 37.65 + 0.2dB.
             750 + 2% or 57.5 + 0.2dB.

RIAA Accuracy*

from 20 Hz - 20 KHz:

better than + 0.0 dB/-0.5 dB.

Phono Overload

F = 1KHz:
Phono MM 
Phono MC

250 millivolts RMS.
25 millivolts RMS.

Total Harmonic Distortion from 20 Hz - 20 KHz;
RIAA de-emphasis

Vout=0.25 Volts RMS
MM input to output:
MC input to output:

Vout=10 Volts RMS
MM input to output:
MC input to output:

no more than 0.1%.
no more than 0.1%.

no more than 1%.
no more than 1%.

IM Distortion 
(60Hz:7KHz  4:1) SMPTE;
RIAA de-emphasis:

Vout=0.25 Volts RMS
MM input to output:
MC input to output:

Vout=10 Volts RMS
MM input to output:
MC input to output:

no more than 0.1%.
no more than 0.1%.

no more than 1%.
no more than 1%.

Inputs

Unbalanced:

gold plated single-ended RCA connectors.

Input Sensitivity*

             
Vout=0.125 Volts RMS, F = 1KHz

MM input:
MC input:

1.66 millivolts RMS + 2%.
0.167 millivolts RMS + 2%.  

Input Impedance

47 KOhms shunted by 200 pF.
40 Ohms.

Outputs

 
Unbalanced:

gold plated single-ended RCA connectors.

Output Impedance

typically 3.5 KOhms.

Noise*

 
signal-to-noise ratio, below 1 Volts RMS output,  A unweighted

MM input to output (shorted input): 
MC input to output (shorted input):

MM input to output, with IHF dummy
       load in MM position: 
MC input to output, with IHF dummy
       load in MC position:

better than 88dB.
better than 87dB.

better than 84dB.

better than 83dB.

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 filter chokes; 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:

• LED control.

Rear Panel Connectors and Controls:

• IEC320 power inlet (3 lug).

• EARTHING post.

• PHONO grounding post.

• Two pairs of INPUT CONNECTORS RCA for PHONO inputs.

• Two SELECTOR/GAIN switches.

• One pair of OUTPUT CONNECTORS RCA.

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,  and automatic switching to muting in case the AC line drops or is interrupted.

AC voltage fuses:

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

General

Power Consumption:

Typically 70 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:

4.5 inches high x 19 inches wide x 13.875 deep + 1.375 inches for front handles.

Unit weight
     regular version:
     deluxe version:

Shipping weight
     regular version:
     deluxe version:

22 Lbs (10 Kg).
41.5 Lbs (18.84 Kg).


43.1 Lbs (19.57 Kg).
62.6 Lbs (28.42 Kg).

Tube Complement

• V101 - 417A/5842 (left channel, first amplification stage);
• V102 - 417A/5842 (right channel, first amplification stage);
• V103 - 417A/5842 (left channel, second amplification stage);
• V104 - 417A/5842 (right channel, second amplification stage);
• V105 - 6X4 (full wave voltage rectifier).