Sunday, August 4, 2019

4CX250B Linear Amp Circuit Diagram.

Click on the image for a full sized view.
















This is a circuit diagram of the HF linear amp I am building.

Linear Amp Power Supply

Here is a picture of the power supply I am building.

Black object is the Toshiba 2kv transformer. Taps for 1500, 1600 and 1700 volts rms @ 0.5 amps (1KW continuous rated). Caps are 8uf 2,500 volts DC (24uf total). Transformers at the back from left to right. (1) 6.3 vac heater 4 windings each capable of 2.5 amps plus several low voltage windings +12 0 -12 volts to power regulator electronics. (2) HV transformer with 300, 225, 170 and 110 volt rms windings. (3) 24 volts for relays. (4) 12 volts for relays. Mounted vertically between the EHV transformer and the caps is the EHV rectifier board. Obscured behind the font panel is the resistor network for the EHV meter. There are still various sockets to be mounted on the back panel. Shown are the power on/off switch, power filter, 2 fuses, 12 pin Jones socket for HV and other power voltages and three uhf type connectors for heater voltage. The supply is to power three seperate amps each running a pair of 4CX250B's. The supply is not capable of running all amps at the same time but there is most certainly enough grunt to run each amp up to full rated power of about 600 plus watts.