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3.2. Power Supply
This Power amplifier uses two 3 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 420
V (total 3360V) @ 2.5A . 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 200mA. 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.
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