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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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PHONO TUBE PREAMPLIFIER

 

 2 3
4 5 6
7 8 9
13 14 15
16 17 18
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The above figures represent LP1 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
All the measurements were taken with A weighted filter.
 

Rated Output Voltage*

 


F = 1KHz:
.
MC1 input to output
MC2 input to output
MM input to output


0.135 Volts RMS.
0.135 Volts RMS.
0.135 Volts RMS.

Voltage Gain*

 


F = 1KHz:
.
MC1 input to output
MC2 input to output
MM input to output


3,560 + 2% or 71 + 0.2dB.
970 + 2% or 59.7 + 0.2dB.
100 + 2% or 40 + 0.2dB.

RIAA Accuracy*

 

from 20 Hz - 20 KHz:

better than + 0.05 dB/-0.3 dB, typically.

Phono Overload

 


Input voltage @
F = 1KHz for 1% THD+N:


Phono MC1
Phono MC2 
Phono MM


.
.
.

14 millivolts RMS, typically.
45 millivolts RMA, typically.
425 millivolts RMS, typically.


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

 


Vout=0.135 Volts RMS:

MC1 input to output
MC2 input to output
MM input to output

Vout=20 Volts RMS:

MC1 input to output
MC2 input to output
MM input to output


.
.

no more than 0.1%.
no more than 0.07%.

no more than 0.04%.

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

Inputs

 

Unbalanced:

gold plated single-ended RCA connectors.

Input Sensitivity*

 
             
Vout=0.135 Volts RMS, F = 1KHz:

MC1 input
MC2 inputt
MM input


.
.

0.038 millivolts RMS + 2%.
0.14 millivolts RMS + 2%.

1.35 millivolts RMS + 2%.

Input Impedance

 

 
F = 1 KHz:

MC1 input
MC2 inputt
MM input (standard factory adjustment)

MM impedance load settings:

MM capacitance settings:


.
31.5 Ohms, typically.
430 Ohms, typically.

47 KOhms shunted by 200 pF.

100 Ohms, 10 KOhms, 47 KOhms, 75 KOhms, 100 KOhms

100 pF, 150 pF, 200 pF, 300 pF, 400 pF

Outputs

 
Unbalanced:
gold plated single-ended RCA connectors.

Corrected Output Impedance

 

F = 1 KHz:

1.3 KOhms, typically.

Noise*

 

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

MC1 input to output (shorted input): 
MC2 input to output (shorted input):
MM input to output (shorted input):

.

.


better than 78dB.
better than 79.5dB.

better than 81.5dB

          Absolute Phase  

MC1 input to output
MC2 input to output
MM input to output

non-inverting.
non-inverting.
non-inverting.

Operating Temperature

 

 

-4 to +104 degrees Fahrenheit 
(-20 to +40 degrees Celsius) ambient.

Power Supply
(Each LP1 contains two identical external power supplies – one for each channel.   Therefore, all further information regarding power supply is shown for ONE power supply, unless otherwise indicated)

 

.
nominal line voltage:

input voltage range:

.
100-240 Volts, 50/60Hz.  
.
±10%.

Two power transformers; two vacuum tube rectifiers, three filter chokes; one high speed vacuum tube voltage regulator, two solid-state analog non-switching voltage regulators.

AC voltage intensively filtered by special RFI power line filter.

            Power Supply Energy Storage  


approximately 102 Joules.

Front/Rear Panel Control,
Preamplifier unit

 

.
Front panel controls:

  • Two LED controls (one for each channel).
  • Two POWER switches (one for each channel).
  • Four SELECTOR switches (two for each channel).

Rear panel connectors and controls:

  • Six INPUT CONNECTORS RCA for PHONO inputs.
  • Two OUTPUT CONNECTORS RCA.
  • PHONO grounding post (one for each channel).
  • EARTHING post (gold-plated)..
  • Two XLR CONNECTORS (7 pins, gold-plated) for connecting the power supply cables.

Front/Rear Panel Control,
Power Supply unit

 

.
Front panel controls:

  • LED control.

Rear panel connectors and controls:

  • IEC320 power inlet (3 lug).
  • EARTHING post (gold-plated).
  • One XLR CONNECTOR (7 pins, gold-plated) for connecting the power supply cables.

Features

 


Pure class A vacuum tube design. All stages are single-ended.
No loop feedback is employed.  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.

Tremendous reserves of headroom and output drive capability are engineered into the LP1.

Specially designed damping panel installed in the LP1 effectively isolates all sensitive electronic components from any induced resonances.

Absolutely outstanding signal-to-noise ratio makes the LP1 one of the quietest phono preamps available on the market.

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.

Vacuum tube voltage regulator overload protection:
0.125 Amp 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.

0.125 Amp slo-blo for 100/120/220/230/240 Volts.

General

 

.
Power consumption:

Typically 170 Watts.
Typically 85 Watts (with one channel turned on).  

Burn-in time at factory:

Minimum 72 hours.

Recommended burn-in time in end-user's system:

Minimum 160 hours.

Warm-up time:

Minimum 30 minutes.

.
Unit dimensions
(identical for preamp and power supply):

Crate dimensions::

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

23 inches x 19 inches x 10 inches
(58.42cm x 48.26cm x 25.4cm)

.
Unit weight
     preamplifier:
     power supply:

Shipping weight
    
preamplifier:
     power supply:

.
.

36.8 Lbs (16.7 Kg).
20.7 Lbs (9.4 Kg).


54.8 Lbs (24.9 Kg).
38.7 Lbs (17.6 Kg).

.
TUBE COMPLEMENT

preamplifier:

 

 



power supply:

 

  • V101 - 6C3P / 6C3П (original) (left channel, first amplification stage);
  • V102 - 6C3P / 6C3П (original) (right channel, first amplification stage);
  • V103 - 6C45P-E / 6C45П-E (original)
    (left channel, second amplification stage);
  • V104 - 6C45P-E / 6C45П-E (original)
    (right channel, second amplification stage)

  • V101, V102 - 12AX3/12BE3 rectifier tubes;
  • V103 - 6C19P / 6C19П, voltage regulator tube;
  • V104 -5651A, voltage reference tube;
  • V103 -12AX7/ECC83, voltage regulator tube.

 

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