Attached is schematic, I don't think it has been posted yet.
You mentioned trying to measure the 100R resistors and said they should be separated if the heater winding is disconnected. The tube heaters are still connected as is the bridge rectifier BR102. So they are not separated and that is why they still measure 50ohms, which means they should be good.
You mentioned trying to measure the 100R resistors and said they should be separated if the heater winding is disconnected. The tube heaters are still connected as is the bridge rectifier BR102. So they are not separated and that is why they still measure 50ohms, which means they should be good.