While the sub is running on the surface, the radar unit gives trouble. Just before the radar technician pulls out the faulty radar display unit, he asks the control room "to send up a one-two-S-S-7." (This is an octal-base pentode vacuum tube (valve) used in RF and IF stages of a receiver.) No radar or radio technician would ever refer to it as a "one-two-S-S-7. In receiving tube parlance the first one or two numbers refer to the filament (heater) voltage which in this case is 12 volts. He should have asked for a "twelve-S-S-7"
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05/03/2025 alle ore 07:42
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