Covering the frequency spectrum between kHz and 54 MHz in five fundamental bands, it serves as an excellent source of modulated or unmodulated RF as well as audio. The RF oscillator consists of a bootstrap circuit that is characterized by low RF distortion. The oscillator output is buffered by an emitter-follower stage to minimize loading effects. A vernier control permits any frequency to be set easily and accurately on any of the five tuning bands. A self-contained, low-distortion, Hz audio oscillator is included in the instrument. The Hz audio signal is also made available at front panel jack-top binding posts.
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There are two. This provides a path for noise from the hot side of the line to neutral preventing it from getting into the generator. Out of curiosity, I took the. With the capacitors connected the voltages were equalized at approximately 14 VAC. The capacitors also provided an additional safety feature to any person working on the generator. Best to never get too confident when working on tube equipment as there are lethal voltages everywhere.
The transformer feeds the 6X5 full wave rectifier tube which delivers approximately volts to the first resistor that forms an RC filter with the filter capacitor and second resistor which feeds the 6SN7 tube with approximately volts on the plate. The voltage on the filter capacitor is approximately VDC.
The anode of that part of the tube is at RF ground through capacitor C2. One half of the 6SN7 twin triode is configured as a type of Armstrong or Tickler coil oscillator. Each switchable coil has one end tied to ground while the top is coupled via capacitor C11 to the control grid.
The DC voltage of the control grid is set by K resistor R1 which ties it to the cathode. The taps on the coils are tied directly to the tube cathode. Below this, the cathode has a 10K resistor in series with a 10K potentiometer where the signal is taken out of the wiper through capacitor C7 to the RF out terminal while the bottom end of the potentiometer is connected to ground.
The Hz oscillator utilizes half of the 6SN7 twin triode where it is configured as a Hartley oscillator. The coil has two capacitors in series across it and the point where they meet is tied to ground. R4 is the 20 ohm cathode resistor and R3 is the grid resistor. C3 acts as the grid capacitor. At this point, the audio is also taken off and applied to the audio output potentiometer and output BNC terminal. Add Tip.
Eico Diagrams, Schematics, Service Manuals
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Eico: eico model 330 rf signal generator
EICO 330 MANUAL PDF