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When this radio was built, voltages were probably listed as tested with an analog multimeter. Today, line voltage is higher, and the meter you are using is more sensitive and loads the circuit less, so you will typically read higher voltages. The voltages you listed earlier are reasonable. Are you getting 7.9 volts with all the tubes plugged in and heaters glowing? That does seem a bit high but don't think there's anything wrong with your transformer. If turns were shorted you'd get lower voltage and the xfrmr. would get toasty.
With set turned on and no tubes plugged in you will get higher heater voltage. With all tubes plugged in, the voltage should come down to close to 6.3 AC, maybe a bit higher allowing for higher line voltage. Set your meter to 200 volts AC and stick the probes in the wall socket. What's your line voltage?
Did you do the freeze test on resistors yet? No need to replace all the resistors in the set. I almost never have a bad resistor, or only one or two.
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Reece
Perfection is hard to reach with a screwdriver.
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