9
3.2. Power Supply
This Power amplifier uses two 2 kVA toroidal transformer. A soft start is provided using relays and
resistors (placed on the switch-ON board). The high voltage is made by combining
8 x 410 V (total
3280V) @ 2,0 A . Each has its own rectifier and filter. In the high voltage circuit, safety resistors are
employed to protect the amplifier against overload (placed on the power supply board).
The separate screen grid supply is regulated and stabilized with MOSFET circuits and delivers abt.
350V DC at 120mA. Control grid voltage is also stabilized (-120V DC). Change of stabilized first grid
voltage is controlled by the software (EBS for example).
The transformer primary is Tap adjustable for 220 , 230 or 240V AC.
The factory setting is 230 VAC .
If the AC voltage in your network is 220 or 240 Volts, you need to set the correct transformer
tap before first starting the PA. See part 7.1. for more information. Other primary voltage is possible
on request (for example 200V 50/60 Hz for Japan).
3.3. Safety Devices
Control and monitoring circuits ensure control and safety during malfunctions of the PA. These are
placed on the Control board, which is located on the chassis subpanel.
One of the important safety elements is a
mechanical switch for AC blocking an opened
amplifier.
4.
INSTALLATION
Read this chapter carefully prior to starting installation. Before unpacking inspect shipping
carton for any damage. Keep all of packing parts for possible future shipment. Check
unpacked power amplifier. If you find any damage, contact your dealer immediately to keep
full warranty.
Type of supported TCVR and working
frequency are visible on the display.
AUTO LED is ON.
