Rotary input switches
Early Type 1A1 and W and Type 82 plug-ins have a rotary input coupling switch that is concentric with the BNC input connector. This switch can give trouble. The Tek part number is #260-603.
Pictures
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1A1 Rotary input switch
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Front
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Rear
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Internals
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Internals
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Internal - Contacts
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Schematic