Lionel KW diode installation

Lionel KW diode installation

Lionel transformers use a selenium rectifier disc to produce a jolt of DC voltage to activate their train whistle. These discs degrade over time, so a decades-old transformer often produces a pretty anemic whistle–even one of the bigger transformers like the 190-watt Lionel KW. Replace the disc with a diode for a cost effective and reliable fix for that wimpy whistle. Here’s a step by step guide to a Lionel KW diode upgrade.

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