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That's a nice early example you have there. Shame the system switch has been removed.
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It was common to link out system switches once dual standard sets were being used on UHF only. Depending on the model I would disconnect the linkage and fix the switch in the 625 position routinely on any sets that I was refurbishing for sale.
On some Philips sets and the Thorn 1400 I would usually fit wire links to the print side of the board if the switch was a bit intermittent.
Why remove the switch completely though? A bit strange that... I can't see it was due to leakage, especially on the IF panel switch. burnt contacts wouldn't matter if the switch was linked and mechanically disconnected.
It looks like someone got a bit bogged down with this and gave up.
Rich.