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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 Signature
   
description specs
L2 Reference
   
description  specs
newLP1 Signature
    
1 description 1 specs
LP2 (regular/deluxe)
 
   description  specs

Prices

 

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PHONO TUBE PREAMPLIFIER

 

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The above figures represent LP2 measurements as performed by an independent party,
Mr. Bascom H. King of BHK Laboratory (bhk@rain.org)

 

*All the measurements were taken with a 41-KOhm load connected to the preamplifier's output. 

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

 
 ...
              F = 1 KHz:
              MM input
              MC input
...
...

47 KOhms shunted by 200 pF.
400 Ohms.

Outputs

 
Unbalanced:
gold plated single-ended RCA connectors.

Output Impedance

 

corrected output impedance:

typically 3.5 KOhms.

Noise*

 

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

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.


          Absolute Phase  
             MM input to output:
             MC input to output:
              non-inverting.
              non-inverting.

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.

            Power Supply Energy Storage  

regular version:
deluxe version:

approximately 125 Joules.
approximately 150 Joules.

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 100 hours.

Warm-up time:

Minimum 45 minutes.

.
Unit 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
     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).

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