GLA-TC1, DICTATOR SUPPORT

– The switch under the red LED is in the down position.
– Inadequate mains voltage.

Solution:

– Set the switch below the red LED to the upper position.
– Check the mains voltage level at the operating site.
– Check that the mains voltage requirement of the device is corresponds to the voltage what is available at your location.

– Voltage fluctuation on the mains network.
– Inadequate mains voltage

Solution:

– Check the mains voltage and whether it is suitable for your device. (You can read the required voltage on the backpanel’s serial label.)
– Eliminate voltage fluctuations. (Use another outlet or voltage conditioner.)
– Replace the fuse.

– It is normal on this type of equipment, it does not affect the operation of the device.

– The charged elements in the vacuum tubes can mechanically vibrate, changing the distance between the elements, producing charge flows in and out of the tube in a manner identical to a capacitor microphone. A system sufficiently susceptible to microphonics could experience audio feedback, and make noises if jarred or bumped.

– Be sure to avoid hitting or dropping the device.

– If the phenomenon is extreme, it may be necessary to replace the tubes.

Case 1 – It also happens in the bypass position.

– The source signal levels do not match on either side.
– The connecting cables are defective.

Case 2 – In the bypass position, both signal levels are the same.

– The device must be recalibrated. (See the Calibration Manual at the Downloads section.)
– Vacuum tubes are worn and need to be replaced.

-Most of the time it is a “ground related” noise.

– Professional audio equipment intended for use with balanced lines may have a ground lift switch for the cable shield. The ground lift switch eliminates unwanted hum and buzz by interrupting the ground loops between equipment, preventing current flow along the cable shield between two devices. 

Solution:

– Use the ground lift switch at the back on the device.

– The peculiarity of the valve architecture is that it may be need to recalibrate the equipment over time during the life of the tube.

– Follow the steps in section 9 of the Calibration Manual to correct the phenomenon. If you do not have the necessary knowledge to carry out all of the operations properly, please do not attempt any modification inside the device, as you may be exposed to the risk of electric shock or damage of the equipment.