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Products

Power amplifiers
       M1.2 Reference
     
description  specs
       M2.2
    
description  specs
       ML1.1
    
description  specs
      ML2.1
    
description  specs
ML3 Signature
    
description  specs
Preamplifiers
LL2.1(regular/deluxe)
     description  specs
LL1 Signature
    
description  specs
     L2 Reference
    
description  specs
     LP2 (regular/deluxe)
                phono preamp
     description  specs

Prices

 

 
PUSH-PULL TUBE POWER AMPLIFIER

 

 

The above figures represent ML1.1 measurements as performed 
by an independent party,
Mr. Bascom H. King of BHK Laboratory (bhk@rain.org)

 

Rated Output Power

minimum continuous sine-wave power, 
from 20Hz-20KHz with no more than:

0.3% THD (FTC) @ rated line voltage
2% THD (FTC) @ rated line voltage

0.3% THD (FTC) @ rated line voltage
2% THD (FTC) @ rated line voltage

0.3% THD (FTC) @ rated line voltage
2% THD (FTC) @ rated line voltage

 


1 Watt into 8 Ohms. 
80 Watts into 8 Ohms.

1 Watt into 4 Ohms. 
80 Watts into 4 Ohms.

1 Watt into 2 Ohms. 
80 Watts into 2 Ohms.

Rated Output Voltage

 


with continuous sine waves, from 20Hz-20KHz @ rated line voltage:

 

  • 35.78 Volts peak into 8 Ohms, corresponding to 160 Watts peak.

  • 25.3 Volts peak into 4 Ohms, corresponding to 160 Watts peak.

  • 17.89 Volts peak into 2 Ohms, corresponding to 160 Watts peak.

Rated Output Current

 


with continuous sine waves, from 20Hz-20KHz @ rated line voltage:

 

  • 4.47 Amps peak into 8 Ohms, corresponding to 160 Watts peak.

  • 6.32 Amps peak into 4 Ohms, corresponding to 160 Watts peak.

  • 8.94 Amps peak into 2 Ohms, corresponding to 160 Watts peak.

Maximum Output Power

 


with
continuous sine-waves,
from 20Hz-20KHz, with no
more than 5%
THD (FTC) @ rated line voltage:

 

  • 90 Watts into 8 Ohms. 

  • 90 Watts into 4 Ohms.

  • 90 Watts into 2 Ohms. 

Maximum Output Voltage

 


with continuous sine-waves,
from 20Hz-20KHz
@ rated line voltage:

 

 

  • 37.95 Volts peak into 8 Ohms, corresponding to 180 Watts peak.

  • 26.83 Volts peak into 4 Ohms, corresponding to 180 Watts peak.

  • 18.97 Volts peak into 2 Ohms, corresponding to 180 Watts peak.

Maximum Output Current

 


with continuous sine-waves,
from 20Hz-20KHz
@ rated line voltage:

 
  • 4.74 Amps peak into 8 Ohms, corresponding to 180 Watts peak.

  • 6.71 Amps peak into 4 Ohms, corresponding to 180 Watts peak.

  • 9.49 Amps peak into 2 Ohms, corresponding to 180 Watts peak.

Small Signal Frequency Response

 


at 1 Watt into 8 Ohms @ rated line voltage:


(-3dB) 4 Hz,  82 KHz.

Frequency Response

 


at 80 Watt into 8 Ohms @ rated line voltage:


(-0.3dB) 20 Hz, 20 KHz.

Slew Rate

 


Vout=70 Volts peak-to-peak of
square-wave signal into 8  Ohms,
F=10KHz @ rated line voltage:




10 Volts per microsecond

Rise Time

 


Vout=70 Volts peak-to-peak of
square-wave signal into 8 Ohms,
F=10KHz @ rated line voltage:




6 microseconds

Noise

 


Signal/Noise ratio ref. 2.83 Volts RMS into 8 Ohms (1 W):

wideband
A weighted

Signal/Noise ratio ref. 25.3 Volts RMS into 8 Ohms (80 W):

wideband
A weighted





83 dB
96 dB

 

 
106.3 dB
115 dB

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

 


from 1-80 Watts into 8 Ohms 
@ rated line voltage

from 1-80 Watts into 4 Ohms
@ rated line voltage

from 1-80 Watts into 2 Ohms
@ rated line voltage



no more than 5%


no more than 5%


no more than 5%

Voltage Gain

 

 


21.2 2% or 26.5 0.2dB.

Inputs

 


Pseudo-balanced, non-inverting








Single-ended, non-inverting


3-pin XLR connector.

Pin assignment:

pin 1 = signal ground;
pin 2 = non-inverting input;
pin 3 = not connected.

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 PREAMP.

Input Sensitivity

 
             
             


1.2 Volts RMS 2% for 80 Watts into 8, 4, and 2 Ohms.

Input Impedance

 
 

41 KOhms shunted by 470pF.

Outputs

 
 

Three sets of gold plated binding posts

Output Impedance

 


at 1 KHz: 

from 20 Hz 20 KHz:       


typically 1.025 Ohms.

typically 1.025 +0.118/-0.025 Ohms.

Damping Factor

 


at 1 KHz: 

from 20 Hz 20 KHz:   


typically 7.8 re: 8 Ohms.
 
typically 7.8 +0.2/-0.8 re: 8 Ohm.

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%.

One power transformer, six separate power supplies.

AC voltage intensively filtered by special RFI power line filter.

Power Supply Energy Storage

 
 


Approximately 235 joules.

Front/Rear Panel Controls and
Chassis Connectors & Controls

 

Front Panel Controls


LED control.


Rear Panel Connectors and Controls


POWER SWITCH
AC POWER INLET
AC MAINS FUSE, along with corresponding fuse holder
Three sets of gold plated BINDING POSTS
GROUNDING (EARTHING) POST, gold-plated


            
Chassis Connectors and Controls


MULTI-TURN TRIMMING POTENTIOMETER for adjusting the balance of the output stage

MULTI-TURN TRIMMING POTENTIOMETER for setting the idle current of the output tubes

The METER for measuring balance of the output stage

The METER for measuring idle and maximum plate current of the output tubes, as well as for controlling the instantaneous value of plate current during operation

Plate FUSE, along with the corresponding fuse holder

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 on the chassis)

Features

 

AC voltage selector

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

Ultra low-noise power transformer

Custom-made torodial power transformer has no mechanical contact with either the transformer cover or the chassis, as transformer is suspended in a special encapsulant which 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.

Meters

The amplifier is equipped with two meters which allow to control the balance and plate current of the output tubes.

Safety/Protection

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

Unique delay time and electronic protection circuits secure the delay of approximately 2 minutes in supplying the plate voltage to the output tubes, which extends the tube life time and excludes the unpleasant thumps or transients in the system during the amplifier turn on/off.

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
       (3 Amps slo-blo for 220/230/240 Volts);
2.5 Amps fast-acting

General

 

Power Consumption

  • Typically 200 Watts at idle.  

  • 315 Watts @ rated output @ 8 (4,2) Ohms.

  • 325 Watts @ maximum output @ 8 (4,2) Ohms.

Burn-in Time at Factory:

Minimum 72 hours.

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

Minimum 200 hours.

Warm-up time:

Minimum 50 minutes.

Dimensions

8.25 inches (21cm) high x 16 inches (40.64cm) wide x 
20.375 inches (51.75cm) deep
[add 1.3125 inches (3.3cm) of depth for handles located on rear panel]

Unit weight

70 Lbs (31.78 Kg).

Shipping weight

96 Lbs (43.58 Kg).

Tube Complement

  • one 12AX7/ECC83, first amplification stage;
  • one 12BH7A, second amplification stage;
  • two 6C33C-B, output stage.