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The shiny shield is aluminum, so soft you can practically shine it with your tongue. Steel or tin-plated shields . . . forget it.
The lead shield is to minimize microphonics in the oscillator tube from mechanical vibration. Same reason they would never mount the speaker right next to the tuner. So, you want to lash that shield down securely.
The tuner works the same whether the outside's clean or dirty, but after slaving an hour on the insides, I reward myself by spiffing up the parts you can see in a photo.
Phil
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