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Selection of two function modes
The unit shall be in ultralinear mode when UT is selected ( ultralinear connection will have the greater output power and the excellent drive and control).
The unit shall be in triode mode when TR is selected (triode connection shall have smooth, fine and rich sound)

Valve bias measurement
The user may use the ampere-voltage -ohm meter to make the measurement.
Set the meter to the level of DC1V, adjust the volume of the loundspeaker to minimum, insert the　+ and - poles on the meter to the + and - poles of ( BIAS, TEST, POINT )
respectively to measure the voltage by the meter.
The working point setup of this unit shall be 0.55V - 0.6V at the standard voltage of 110V. Valve bias regulation
To replace the new valves, the user shall measure the bias of the four valves by the ampere-voltage-ohm meter. in case of deviation, adjust the variable resistance at each group of holes BIAS ADJ.(V1) BIAS ADJ.(V2) BIAS ADJ.(V3) BIAS ADJ.(V4)
by the proper tools. Turn it clockwise 0 reduce the bias, and turn it counterclockwise to increase the bias, until the bias of the four valves reaches 0.55V-0.6V at the standard voltage of 110V. Make the measurement and regulation once again after the thermal stability of the valves.

Poor power supply, no indicator on
Check the insertion of the power plug, the supply to the socket, the connection of the fuse, and power switch

Note
The manufacture has set up the bias of this unit well before delivery, and mark (V1, V2, V3, V4) on the valves. Therefore, insert the valves correctly as per the numbers respectively marked on the valves and the casings ( V1, V2, V3, V4 ).
Take care not to make any wrong insertion, for the bias difference between the valves may cause the over-current of a given valve, burn it and result in the unnecessary damage.

Warning:don't put this equipment under the rain or in a damp place, otherwise it may cause the fire or electric shock.

NOTE:( Please cut off the power supply to this unit before switching ).

The warranty period for this unit shall be two years, and two months for the valve.

No　Sound
Check the selection of the input signal functional switch, the wiring of the back panel, the connection of signal plug, and the supply to the signal source.

No sound from the right equipment
Check the wiring ( break or short circuit ) of the sound enclosure, the connection of the signal plug or the wiring of the signal line ( break or short circuit )

Wrong position of sound image
Check the pole connection of the sound enclosure and the power amplifire ( + / - ), the position of the sound equipment, and the video / audio products played ( copylighted or not )

With AC noise or other noise
Check the contact of the input signal line or plug, check if there is any unshielded or poorly shielded signal wire used, if there is any welder, motor or engine used nearby that may cause the working interference.
Check the noise from the program source, or if there is any released or poor connection between the valve and the valve holder ( take out the valve, clean it and reinsert it into the holder ).