100W AM Valve Transmitter circuit
Posted on May 3, 2017
The 6LB is a powerful oscillating lamp that may well drive the two 807 correctly, with an upward trend of 1050 VOLTS D.C. The oscillation is in a HARTLEY arrangement and is done with the oscillating coil of the 6SA7 block with a median take-off. The coil for those who want to make it by themselves is from about 85 to about 85 coils. We cut its edge and we measure about 25 coils, take a medium shot and go to the 6L6 downhill 8, continue the winding, and at the end of about 85 spirals, we connect the variable oscillation that is grounding its edge. Continue taking a 100pF capacitor and go to the footplate 5. Here we polarize with a 22KΩ resistor.
With 5.6 KΩ we connect in series with the protective power supply from the 300 volts for voltage drop (foot 4). We also install an RF chuck on the anode to "cut" the source, but this does not disturb the power supply with a high voltage current (leg 3) The coupling is done with a 1000pF capacitor and 22KΩ bias per side For feeding protective mesh On 807 (SCREEN) lamps we generate a voltage drop with a 4.7KΩ resistor from the supply of 6L6 (300V).
In sequence with the high voltage, before the RF anode chuck (807) we place a 0-500mA instrument and then the shaping blades to allow for a small modulation rate control. The 100 Watt transmitter is vertically upright with a 35 Watt (configurable) Duallex amplifier.
After we finish with all of the mechanical construction by placing the transformer on the edge, the electrolytic, the switches, the bases of the lamps, the bows, the variables, the worlds, the ammeter, and after all the mechanical logic ends, we start with the electronic part. We mount the output stage and test it. Finally, we also mount any accessories,
We open the oscillation after we have chosen an empty frequency (usually between 1200-1500 kilocytes), we bring the oscillation to the frequency we want by watching it be an idol (harmonic), after making sure that it is correct and the amplifier closed, open the output and immediately with Variable output tune by passing the instrument to the less mA. "If there are two output variables, a combination of both resonances is made. After making sure that it is the best tuning point (the best sinking), open the amplifier slowly.
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Wolf Feb 24, 2021