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LYDKRAFT ApS

Ved Damhussøen 38,DK 2720 Vanløse

Denmark

TUBE-TECH PA 6

STEREO HEADPHONE AMPLIFIER

General information

Sound quality in headphone monitoring has usually been the end of the line as far as studio

engineering is concerned. This is primarily due to the fact that amplification for this type of

monitoring is nearly always done with amplifiers that have been exclusively designed for

powering loudspeakers.

The

TUBE-TECH PA 6

has been designed especially to be used with headphones and

providing the listener with maximum fidelity.

PRECAUTIONS:

THIS AMPLIFIER CAN PRODUCE VERY HIGH SOUND LEVELS.

CARE SHOULD BE TAKEN WHEN LISTENING TO HEADPHONES, AS YOUR HEARING

MAY BE DAMAGED WHEN EXPOSED TO HIGH SOUND LEVELS.

Design information

The output stage is designed around a dual power triode working in push-pull class A with a

adjustable bias and balancing circuit.

The input and driver circuit also uses dual triodes making the whole amplifier symmetrical from

the single ended input to the output.

All the voltages (except heater voltage for output and driver tubes) are fully stabilised.

Operating information

Several ways of operation are possible:

The

TUBE-TECH PA 6

is used in the control room for high quality listening on headphones in

the same way as the various loudspeaker systems are used.

The

TUBE-TECH PA 6

is used as the power amplification to drive the cue system in the studio.

Here the

TUBE-TECH PA 6

replaces the customary power amplifiers used with most studio cue

systems.

In either case the objective of using the

TUBE-TECH PA 6

is to substantially improve the

quality of sound in the headphones, thereby giving the listener a superior sonic experience.

Summary of content (4 pages)

PAGE 1
TUBE-TECH PA 6 STEREO HEADPHONE AMPLIFIER General information Sound quality in headphone monitoring has usually been the end of the line as far as studio engineering is concerned. This is primarily due to the fact that amplification for this type of monitoring is nearly always done with amplifiers that have been exclusively designed for powering loudspeakers. The TUBE-TECH PA 6 has been designed especially to be used with headphones and providing the listener with maximum fidelity.
PAGE 2
ADJUSTMENT PROCEDURE: INITIAL ADJUSTMENT: POWER SUPPLY: The power supply PCB is located on the rear panel. 1. Adjust the voltage for the output stage to 155V with P1. AMPLIFIER OUTPUT STAGE: IMPORTANT: After replacement of output tubes, it is important that the "initial bias adjustment" is carried out. If this step is neglected, the output tubes may be permanently damaged, due to the possibility of high cathode current. INITIAL BIAS ADJUSTMENT: 1. Turn off Volume. 2.
PAGE 3
5. Place the voltmeter between TP4 and TP6 and adjust the voltage to 50mV (< +/-2mV) with the multiturn trimpot marked BIAS. 6. Place the voltmeter between TP4 and TP5 and adjust the voltage to 0V (< +/-1 mV) with the multiturn trimpot marked BALANCE. 7. Repeat step 5-7 until correct.
PAGE 4
Technical information: Output power (40Hz 1% THD): 5W (in minimum load) Minimum output voltage (RL=600): 30V (strap for 120) Minimum Load (strapable): 120/30/7,5 Frequency response (-3dB): 5Hz - 80KHz Input impedance: Input sensitivity: Noise (22-22kHz): Power requirement: Power consumption: Dimensions (W/H/D): Weight: >10K(unbalanced) 0 dBU for max output -70 dBU (strap for 120) 115/230V 90W 225x170x250 mm 7 kg Loading of the output can be lower than the recommended minimum impedance, witho