I’d been wanting to do this for a long time. Upgrade an AI 500 by converting to a choke power supply along with rewiring, capacitor and resistor upgrades, and upgraded selector switch and volume pot.

Instead of mounting the components in a separate case a la Border Patrol, I mounted the choke on the rear of the case. The sound quality is the best yet. While I don’t have a Border Control power supply for direct comparison this version is right up there, or maybe even better!

The choke is mounted on the rear panel.

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