🔍 Key Concepts

• Audio frequency (AF) amplifier stages and how signal passes from detector to first AF stage • How an open transformer winding, bad capacitor, incorrect bias/plate voltage, or defective tube each affect signal flow • Which faults affect signal in ONE place vs affecting it in MULTIPLE stages

💭 Think About

• Trace the signal path: if audio is present at the detector plate but NOT at the first AF plate, what component(s) are between those two points? • For each answer choice, ask: would this fault prevent signal ONLY at the first AF plate, or would it also prevent hearing anything at the detector plate? • Consider whether more than one type of defect could realistically produce the exact symptom described, or if only one failure mode fits best.

✅ Before You Answer

• Verify whether an open coupling transformer winding between detector and AF would still let you hear signals at the detector plate • Check whether a defective tube in the first AF stage would explain hearing signals in the detector stage but not in that AF plate circuit • Consider if operating potentials (voltages) being wrong could affect multiple components at once, and whether that matches the localized symptom described