Preamplifier with knobs and rope: what they have in common

1. Step 1. Preamplifier with knobs — is part of — Hi-fi amplifier. Input selection and tone control.
2. Step 2. Hi-fi amplifier — has part — Transformer. The power supply is a transformer.
3. Step 3. Transformer — has part — Copper wire. Windings.
4. Step 4. Copper wire — uses — Wire drawing. Drawing.
5. Step 5. Wire drawing — is used in — Wire rope. The wire is drawn.
6. Step 6. Wire rope — evolved from — Rope. A steel counterpart of rope.

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