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J.Ultee: 300B filament tension springs 2
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J.Ultee: 300b anode plate
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J.Ultee: 300B socket connections
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J.Ultee: getter pan of electron tube
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J.Ultee: 300B grid and filaments 2
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J.Ultee: 300B without glas bulb
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J.Ultee: Jadis JA80