All … has anyone physically looked at the off-on part of the Operation switch?.

At first look one might expect it to be a wafer [ poor wafer] , but the schematic of the Ht-37 ?seems to show that it is not a wafer, but they do show and say under the “AC on/off sw”? “part of OS-??”.

The parts list is no help at all…..

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which is not the same No. as the HT-32

I can send a snip showing just the OS area if it is any help? don