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with a gentle tap on the chassis station returns
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You obviously have a problem with a dodgy connection somewhere. Could be the waveband switch, a valve pin not making contact with its holder, or a badly soldered connection.
With the fault present wriggle valves gently in their holders, rotate the wavechange switch slightly, but without clicking to the next position and try tapping components and connections with an insulated tool such as a plastic knitting needle. This should help you localise the fault.