General Description of OM3006 POWER AMPLIFIER
HF PART
In this amplifier a tetrode GU 78b 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 on the opened OM3006
Tetrode
GU77B PWR meter Blower switch -on board
Output Pi-L Circuit
Tuning capacitor
Power supply board
subpanel
