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DESCRIPTION of HF2013DX-A POWER AMPLIFIER
In this amplifier a tetrodetubeFU728F (similar to a 4CX1500B)is used in a grounded-cathode
circuit (input into control grid). This amplifier achieves excellent linearity by the voltage
stabilization of the control grid bias and the screen voltage. The power input is given to the
control grid, using a broadband input circuit with an input impedance of 50 Ohms. This
adaptable input circuitry ensures a good input SWR better than 1.5:1 on all short-wave bands.
The output of the amplifier is a Pi-L circuit. The ceramic capacitor for TUNE and LOAD are
divided. This enables the amplifier to be tuned exactly and makes it possible to easily return
to the previously set positions after band change.
TOP VIEW OF OPENEDHF2013DX-A
HF2013DX-A HF AMPLIFER INSTRUCTION MANUAL
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