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Products

Power amplifiers
M1.2 Reference
     description  specs
M2.2
   
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ML2.2
   
description  specs
ML3 Signature
    
description  specs
Preamplifiers
LL2.1(regular/deluxe)
    description  specs
LL1 Signature
   
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L2 Reference
   
description  specs
LP1 Signature
    
1 description 1 specs
newLP2.1
              (regular/deluxe)
                phono preamp
    1 description   1 specs

Prices

 

1
  SINGLE-ENDED VACUUM TUBE POWER AMPLIFIER

 

Click here to see the measurements performed by an independent party,
Mr. Bascom H. King of BHK Laboratory (bhk@rain.org)


NOTE: We recommend replacing 6N6P tubes about once every two years to maintain the best performance of the amp

 

Rated Output Power


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

0.7% THD (FTC) @ rated line voltage
3% THD (FTC) @ rated line voltage

0.7% THD (FTC) @ rated line voltage
3% THD (FTC) @ rated line voltage

0.7% THD (FTC) @ rated line voltage
3% THD (FTC) @ rated line voltage


.
.

1 Watt into 16 Ohms.
18 Watts into 16 Ohms.

1 Watt into 8 Ohms
18 Watts into 8 Ohms.

1 Watt into 4 Ohms
18 Watts into 4 Ohms.

Rated Output Voltage

 


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

 
  • 24 Volts peak into 16 Ohms, corresponding to 36 Watts peak.
  • 16.97 Volts peak into 8 Ohms, corresponding to 36 Watts peak.
  • 12 Volts peak into 4 Ohms, corresponding to 36 Watts peak.

Rated Output Current


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

 
  • 1.5 Amps peak into 16 Ohms,corresponding to 36 Watts peak.
  • 12 Amps peak into 8 Ohms,corresponding to 36 Watts peak.
  • 3 Amps peak into 4 Ohms, corresponding to 36 Watts peak.

Maximum Output Power

 

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

 
  • 21 Watts into 16 Ohms.
  • 20 Watts into 8 Ohms.
  • 20 Watts into 4 Ohms.

Maximum Output Voltage

 


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

 
  • 25.92 Volts peak into 16 Ohms, corresponding to 42 Watts peak.
  • 17.89 Volts peak into 8 Ohms, corresponding to 40 Watts peak.
  • 12.65 Volts peak into 4 Ohms, corresponding to 40 Watts peak.

Maximum Output Current

 


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

 
  • 1.62 Amps peak into 16 Ohms, corresponding to 42 Watts peak.
  • 2.24 Amps peak into 8 Ohms, corresponding to 40 Watts peak.
  • 3.16 Amps peak into 4 Ohms, corresponding to 40 Watts peak.

Small Signal Frequency Response

 

at 1 Watt into 16 Ohms @ rated line voltage:

(-3dB) 3 Hz,  80 KHz.

Frequency Response

at 18 Watt into 16 Ohms @ rated line voltage:

(-0.3dB) 20 Hz, 20 KHz.

Slew Rate

 


Vout=48 Volts peak-to-peak of
square-wave signal into 16 Ohms,
F=10KHz @ rated line voltage:




15 Volts per microsecond

Rise Time

 


Vout=48 Volts peak-to-peak of
square-wave signal into 16 Ohms,
F=10KHz @ rated line voltage:




2.5 microseconds

Noise


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

2 Hz – 22 KHz
A weighted

Signal/Noise ratio ref. 16.97 Volts RMS
into 16 Ohms (18 Watts):

22 Hz – 22 KHz
A weighted





typically 87 dB.
typically 90 dB.





typically 99.5 dB.
typically 102 dB.

Voltage Gain

 
19.97 + 2% or 26 + 0.2dB into 16 Ohms.
14.12 + 2% or 23 + 0.2dB into 8 Ohms.

9.98 + 2% or 19.98 + 0.2dB into 4 Ohms.

IM Distortion 
(60Hz:7KHz 4:1) SMPTE:

 


from 1-18 Watts into 16 Ohms
@ rated line voltage

from 1-18 Watts into 8 Ohms
@ rated line voltage

from 1-18 Watts into 4 Ohms
@ rated line voltage




no more than 8%


no more than 8%


no more than 8%

Inputs

 


Pseudo-balanced, non-inverting:







Single-ended, non-inverting


3-pin XLR connector.

Pin assignment:

pin 1 = signal ground;
pin 2 = non-inverting 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

 

18 Watts into 16, 8, and 4 Ohms


0.85 Volts RMS 2%


Input Impedance

 

41 KOhms shunted by 470pF.

Outputs

 

Three sets of gold plated binding posts for 4-, 8-, and 16-Ohm loads.

Output Impedance

 


at 1 KHz:


from 30 Hz - 20 KHz:


typically 1.68 Ohms; 16-Ohm tap.
typically 0.84 Ohms; 8-Ohm tap.
typically 0.42 Ohms; 4-Ohm tap.

typically 1.68 +0.14 Ohms; 16-Ohm tap.
typically 0.84 +0.07 Ohms; 8-Ohm tap.
typically 0.42 +0.035 Ohms; 4-Ohm tap.

Damping Factor


at 1 KHz:



from 30 Hz - 20 KHz:


typically 9.5 re: 16-Ohm load.
typically 9.5 re: 8-Ohm load.
typically 9.5 re: 4-Ohm load.

typically 9.5 +0.7 re: 16-Ohm load.
typically 9.5 +0.7 re: 8-Ohm load.
typically 9.5 +0.7 re: 4-Ohm load.

Operating Temperature

 

+23 to +104 degrees Fahrenheit
(-5 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, five filter chokes, six separate power supplies, including high current vacuum tube voltage regulator for the output stage.

AC voltage intensively filtered by special RFI power line filter.

Power Supply Energy Storage

 

Approximately 160 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
  • Two DC POWER JACKS (central pin 2mm dia.) for connecting remote control/link cables
  • GROUNDING (EARTHING) POST, gold-plated

Chassis Connectors and Controls

  • MULTITURN TRIMMING POTENTIOMETER for setting the nominal value of plate voltage of the output tube
  • MULTITURN TRIMMING POTENTIOMETER for setting the nominal value of plate current of the output tube
  • Set of testpoints for measuring the value of plate voltage of the output tube by using the external voltmeter
  • Set of testpoints for measuring the value of plate current of the output tube by using external voltmeter
  • 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)

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.

Wide-band output transformer

Custom-made output transformer especially designed for handling high current low impedance output tubes and assuring reproduction of a full spectrum of audio frequencies at any level of output power within its specified range.

Remote control
Power on/off.
Available remote link cable coordinates the remote functions of two or more amplifiers.

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 tube, which extends the tube life span 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:
4 Amps slo-blo for 100/120 volts;
2 Amps slo-blo for 220/230/240 Volts;
1.25 Amps fast-acting plate fuse for the output tube (V2);
0.125 Amp slo-blo for on/off and remote control circuitry, internally mounted.

General

 

Power Consumption

Typically 245 Watts @ rated output @ 16 (8,4) 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 45 minutes.

.
Unit dimensions:


Crate 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
]

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

Unit weight

81 Lb (36.8 Kg).

Shipping weight

107 Lbs (48.6 Kg).

Tube Complement

   Amplifier section:
  • one 12AX7/ECC83, first amplification stage;
  • two 6N6P, second amplification stage;
  • one 6C33C-B, output stage.
    NOTE: we recommend replacing 6N6P tubes about once every two years to maintain the best performance of the amp
    Voltage regulation  section:
  • one 5651, voltage reference tube.
  • one 6AK5/5654, voltage regulator tube;
  • one 6C33C-B, voltage regulator tube.