Owner`s manual

15
Ayon Audio – Hart 18 – 8101 Gratkorn – Austria – Phone: [phone]
www.ayonaudio.com
6.1. Activation of the auto-fixed-bias system in case of wrongly placed power tubes (socket)
In case that you did put the original AA62B tubes in a socket different from the marking on the package
(V1, V2) or you do not remember where which tube was to be put, it is mandatory that you manually
activate the auto-fixed-bias system, after turn on, wait 2 minutes and then press the bias set up button.
This is necessary to find out the new bias reference voltage to enable the “auto fixed bias system” to tune
the tube to its best operating parameters. (The “auto fixed bias system” can again control the tube in its
optimum bias-window and get the maximum out of it).
7. Hum adjustment for power tubes
First, listen to the speaker connected to the power amplifier for excessive hum; correct it if the hum level is
too high following the procedure below. You always may have to re-adjust the hum when exchanging
power tubes, or when your power tubes appear to be humming.
A D J U S T M E N T P R O C E D U R E
■ Switch on (volume to zero position), and wait for normal operation.
■ There is a heater-balance hum potentiometer for each output tube to adjust the outputs for
minimal hum as the tubes age. Rotate the screwdriver slowly to listen the changes on the hum level.
Try to rotate the pot screw in both directions and listen the effect of the change. Adjust the setting of
the hum to its minimum level. The amount of adjustment required should be small.
8. Troubleshooting – in general
If you experience any problem with this unit, please take the time to look through this chart and see if you
can solve the problem yourself before you call your dealer.
No power: Check the connection to the AC power supply. Check and make sure the AC source is not a
switched outlet and that, if it is, the switch is turned on. Insert the power cord into the AC inlet of this unit.
There is no sound: Press the power switch to turn on the unit, your external pre-amplifier (if any), and disc
player etc. Make sure a signal is output from a pre-amplifier or a CD-player etc. Check if the pre-amplifier,
speakers and source components are secure connected. Select input setting of the pre-amplifier etc.
correctly. Adjust the pre-amplifier volume. The protection circuit is maybe in operation (cut off) when
there is no Bias readable. Turn off the unit and solve the cause of problem.
Power tube will not bias: If the meter provides a reading but the tube will not bias correctly, the tube is
probably bad.