The 830 is a "HYBRID" transceiver , The "POWER" switch turns on the receiver and quite a bit of the transmitter circuitry.
The "HEATER" switch , turns on the filament supply to the tubes and the High Voltage supply .
You can just turn on the "POWER" if all you want to do is listen , while leaving the "HEATER'S" and high voltage off, but you must have the "HEATER" switch on to load , tune and transmit.
YES, the proper sequence is "POWER" on first then the "HEATERS" .
DO a "GOOGLE" search for the "KENWOOD TS-830s MANUAL" and you should find several link's to it as well as the service manual.
73, John
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DE: John W9WLS
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