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

 

1
  SINGLE-ENDED VACUUM TUBE POWER AMPLIFIER

 

NOTE:

GM-70 tube should be replaced every 1.5 years
to maintain the best performance of the amp

Power Output

 


32 Watts into 16, 8, or 4 Ohms.


Rated Output Power

minimum continuous sine-wave power, 
at 1 KHz with no more than:

0.3% THD (FTC) @ rated line voltage
3% THD (FTC) @ rated line voltage

0.3% THD (FTC) @ rated line voltage
3% THD (FTC) @ rated line voltage

0.3% THD (FTC) @ rated line voltage
3% THD (FTC) @ rated line voltage

 


1 Watt into 16 Ohms. 
30 Watts into 16 Ohms.

1 Watt into 8 Ohms. 
30 Watts into 8 Ohms.

1 Watt into 4 Ohms. 
30 Watts into 4 Ohms.


Rated Output Voltage

 


with continuous sine waves, 
at 1 KHz  @ rated line voltage:

 

  • 30.98 Volts peak into 16 Ohms, corresponding to 60 Watts peak.
  • 21.91 Volts peak into 8 Ohms, corresponding to 60 Watts peak.
  • 15.49 Volts peak into 4 Ohms, corresponding to 60 Watts peak.

Rated Output Current

 


with continuous sine waves, 
at 1 KHz z @ rated line voltage:

 

  • 1.94 Amps peak into 16 Ohms, corresponding to 60 Watts peak.

  • 2.74 Amps peak into 8 Ohms, corresponding to 60 Watts peak.

  • 3.87 Amps peak into 4 Ohms, corresponding to 60 Watts peak.

Maximum Output Power

 


maximum
continuous sine-wave power,
at 1 KHz, with no
more than:
   5% THD (FTC) @ rated line voltage
   5% THD (FTC) @ rated line voltage
   5% THD (FTC) @ rated line voltage

 

  • 37 Watts into 16 Ohms. 
  • 37 Watts into 8 Ohms.
  • 37 Watts into 4 Ohms. 

Maximum Output Voltage

 


with continuous sine waves,
at 1KHz
@ rated line voltage:

 

 

  • 34.41 Volts peak into 16 Ohms, corresponding to 74 Watts peak.
  • 24.33 Volts peak into 8 Ohms, corresponding to 74 Watts peak.
  • 17.2 Volts peak into 4 Ohms, corresponding to 74 Watts peak.

Maximum Output Current

 


with continuous sine waves,
at 1KHz
@ rated line voltage:

 
  • 2.15 Amps peak into 16 Ohms, corresponding to 74 Watts peak.
  • 3.04 Amps peak into 8 Ohms, corresponding to 74 Watts peak.
  • 4.3 Amps peak into 4 Ohms, corresponding to 74 Watts peak.

Small Signal Frequency Response

 

at 1 Watt into 16 Ohms @ rated line voltage:

(0, -3dB) 8.5 Hz - 32 KHz.

Frequency Response

 

at 30 Watt into 16 Ohms @ rated line voltage:

(0, -1.5dB) 20 Hz - 20 KHz.

Slew Rate

 


Vout=61.96 Volts peak-to-peak of
square-wave signal into 16 Ohms,
F=10KHz @ rated line voltage:




5 Volts per microsecond

Rise Time

 

.
Vout=61.96 Volts peak-to-peak of
square-wave signal into 16 Ohms,
F=10KHz @ rated line voltage:

.


10 microseconds

Fall Time

 

.
Vout=61.96 Volts peak-to-peak of
square-wave signal into 16 Ohms,
F=10KHz @ rated line voltage:

.


10 microseconds

Noise

 

.
Signal/Noise ratio ref. 4 Volts RMS
into 16 Ohms (1 Watt):

22 Hz – 22 KHz
A weighted

Signal/Noise ratio ref. 21.91 Volts RMS
into 16 Ohms (30 Watts):

22 Hz – 22 KHz
A weighted

.



typically 86 dB.
typically 92 dB.

 


typically 100 dB.
typically 106 dB.

IM Distortion 
(60Hz:7KHz  4:1) SMPTE:

 

.
from 1-30 Watts into 16 Ohms 
@ rated line voltage:

from 1-30 Watts into 8 Ohms
@ rated line voltage:

from 1-30 Watts into 4 Ohms
@ rated line voltage:

.

no more than 10%


no more than 10%


no more than 10%

Voltage Gain

 

30 Watts into 16 Ohms:
30 Watts into 8 Ohms:
30 Watts into 4 Ohms:

25.78 + 2% or 28.22 + 0.2dB.

18.26 + 2% or 25.2 + 0.2dB.

12.89 + 2% or 22.2 + 0.2dB.

Inputs

 


Pseudo-balanced, non-inverting:








Single-ended, non-inverting:


3-pin XLR connector.  

Pin assignment:

pin 1 = signal ground;
pin 2 = signal input;
pin 3 = signal ground.

gold plated RCA connector (connected in parallel with pin 2, non-inverting input, of XLR connector).

ONLY ONE OF THESE INPUTS SHOULD BE CONNECTED TO A PREAMPLIFIER AT THE SAME TIME!

Input Sensitivity

 
30 Watts into 16, 8, and 4 Ohms:  

0.85 Volts RMS ± 2%

Input Impedance

 


41 KOhms shunted by 470pF.

Outputs

 
 
 
Eight gold- plated binding posts.

Output Impedance

 


at 1 KHz:


from 30 Hz – 20 KHz:

 
Typically 6.2 Ohms; 16-Ohm tap.
typically 3.1 Ohms; 8-Ohm tap.
typically 1.55 Ohms; 4-Ohm tap.

typically 6.2 +1.5/-0.1 Ohms; 16-Ohm tap.
typically3.1 +0.75/-0.05 Ohms; 8-Ohm tap.
typically 1.55 +0.375/-0.025 Ohms; 4-Ohm tap.


Damping Factor

 


at 1 KHz:



from 30 Hz 20 KHz:


typically 2.58 re: 16-Ohm load.
typically 2.58 re: 8-Ohm load.
typically 2.58 re: 4-Ohm load.

typically 2.58 +0.043/-0.5 re: 16-Ohm load.
typically 2.58 +0.043/-0.5 re: 8-Ohm load.
typically 2.58 +0.043/-0.5 re: 4-Ohm load.


Operating Temperature

 



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


Grounding

 



Grounding (earthing) post and chassis connected to mains earthing.


Power Supply

 


nominal line voltage

Input voltage range


100-240 Volts, 50/60Hz.  

±10%.

Two power transformers, one filament transformer, six filter
 chokes, seven separate power supplies, six rectifier tubes.

AC voltage intensively filtered by special RFI power line filter.

Power Supply Energy Storage

 
 


Approximately 265 joules.


Front/Rear Panel Controls and
Chassis Connectors & Controls

 


ML3


Front Panel Controls 


LED control.

Chassis Connectors and Controls

 

  • MULTI-TURN TRIMMING POTENTIOMETER for setting the nominal value of plate current  of the output tube V1.
  • Set of TESTPOINTS for measuring the value of plate current of the output tube by using an external voltmeter.
  • Plate FUSE for the output tube, along with corresponding fuse-folder.
  • LOCAL NFB ON-OFF switch, allowing to introduce small
    amounts of local feedback in the output stage.
  • NFB1 - NFB2 switch, allowing to vary the amounts of local feedback (2.4dB and 1.2dB, respectively).
  • One input RCA connector, gold plated (located on the left side of the chassis).
  • One input XLR connector, gold plated (located on the left side of the chassis).

Rear Panel Connectors and Controls

  • Eight gold- plated BINDING POSTS.
  • PANEL RECEPTACLE, MALE for connecting the power supply cable.

ML3-PS

Front Panel Controls 

LED control.

Chassis Connectors and Controls

Six RECTIFIER TUBES (V101 – V106).

Rear Panel Connectors and Controls

  • POWER SWITCH.
  • AC POWER INLET.
  • AC MAINS FUSE, along with corresponding fuse-holder.
  • FRONT-END PLATE FUSE, along with corresponding fuse-holder.
  • PANEL RECEPTACLE, FEMALE, for connecting the power supply cable.
  • Two DC POWER JACKS (central pin 2mm dia.) for connecting remote control/link cables.
  • GROUNDING (EARTHING) POST (gold plated).

Features

 

AC voltage selector

100/120/220/230/240 Volts, internally switchable.


Ultra low-noise power and filament transformers


Custom-made torodial power transformers have no mechanical contact with either the transformer covers or the chasses, as transformers are suspended in a special encapsulant that almost completely absorbs even the residual mechanical vibrations. This plays a significant role in assuring the absolutely unique clarity and micro-resolution during sound reproduction.


Wide-band output transformer


Custom-made output transformer especially designed for handling high voltage power triodes and assuring the  reproduction of a full spectrum of audio frequencies at any level of output power up to the maximum specified.


Remote control

 


Power on/off.

Available remote link cable coordinates the remote functions of two or more amplifiers.


Safety/Protection


"Soft-start" circuit
along with vacuum tube rectifiers protects power supply components from large in-rush currents when the amplifier is turned on.

Protection against possible damages from high voltage transients on AC power line.

Unique delay time and electronic protection circuits secure the delay of approximately 45 seconds before connecting a speaker to the amplifier's output upon its turn-on and also an instant disconnecting of a speaker upon the amplifier's turn-off.  That  excludes the unpleasant thumps or transients in the system.

Thermal resetting fuse controls internal temperature of the power transformer.

Threshold: 248 degrees Fahrenheit
(120 degrees Celcius)

Fuses:

6.25 Amps slo-blo for 100/120 Volts            (ML3-PS),

3 Amps slo-blo for 220/230/240 Volts          (ML3-PS),

0.125 Amp slo-blo for on/off and
         remote control circuitry,
         internally mounted                                (ML3-PS),

0.125 Amp slo-blo Front-End Plate fuse       (ML3-PS),

0.5 Amp fast-acting Plate fuse for the
      output tube                                                  (ML3).

General

 

Power Consumption

Typically 400 Watts @ rated output @ 16 (8, 4) Ohms and at idle.

Burn-in Time at Factory:

Minimum 72 hours.

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

Minimum 100 hours.

Warm-up time:

Minimum 25 minutes.


Unit dimensions (ML3 and ML3-PS):
                                          



Crate dimensions (ML3 and ML3-PS):


8.25 inches (21cm) high x 16 inches (40.64cm) wide x 
20.375 inches (51.75cm) deep
[add 1.4375 inches (3.7cm) of depth for handles located on rear panel]

26" x 21" x 14" (66.04cm x 53.34cm x 35.56cm)


Unit weight
                                           ML3

                                           ML3-PS



79 Lbs (35.9 Kg).  

80.2 Lbs (36.41 Kg).


Shipping weight
                                           ML3

                                           ML3-PS



99 Lbs (44.95 Kg).

100.2 Lbs (45.5 Kg).
  

.
Tube Complement
                                           ML3













                                           ML3-PS


.
V101 - 12AX7/ECC83, first amplification stage; 

V102, V103, V104, V105 -
            -  6N30P-DR / 6H30
П-ДР (original),
               second amplification stage;

V1 – GM-70, output stage.

NOTE: we recommend replacing GM-70 tube about once every 1-1.5 years to maintain the best performance of the amp


V101, V102, V103, V104, V105, V106  -
           - 12AX3 / 12BE3, rectifier tubes

1