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LL2.1(regular/deluxe)
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     LP2 (regular/deluxe)
                phono preamp
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Prices

 

 
SINGLE-ENDED 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 tube about once a year 
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.

  • 2.12 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

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%

Voltage Gain

 

 


21.9 2% or 26.81 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 = 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 PREAMP.

Input Sensitivity

 
             
             


0.775 Volts RMS 2% for 18 Watts into 16, 8, and 4 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 1.68 Ohms.

typically 1.68 +0.14 Ohms.

Damping Factor

 


at 1 KHz: 

from 20 Hz 20 KHz:   


typically 9.5 re: 16 Ohms.
 
typically 9.5 +0.7 re: 16 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, two filter chokes, five 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
GROUNDING (EARTHING) POST, gold-plated


            
Chassis Connectors and Controls


MULTI-TURN 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.

Ultra wide-band output transformer

Custom-made output transformer especially designed for handling high current low impedance output tubes and assuring reproduction of audio frequencies from approximately 18 Hz to 70-80 KHz at any level of output power up to the maximum specified power.

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:
4 Amps slo-blo for 100/120 volts
       (2 Amps slo-blo for 220/230/240 Volts);
1.25 Amps fast-acting

General

 

Power Consumption

225 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.

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

     Amplifier section:
  • one 12AX7/ECC83, first amplification stage;
  • one 6N6P, second amplification stage;
  • one 6C33C-B, output stage.
    NOTE: we recommend replacing 6N6P tube about once a year 
    to maintain the best performance of the amp

       Voltage regulation  section:

  • one 6AK5/5654, voltage regulator tube;
  • one 6C33C-B, voltage regulator tube;
  • one 5651, voltage reference tube.