[Ron Ramirez]

Yes - 1000 ohms/volt was the standard for many years. 20K ohms/volt is much better, and the modern DMMs are in the 1 meg/volt or better range.

If your line voltage is 117, you're lucky - and your radios will like that. Most of us in the States have line voltages in the neighborhood of 125 volts. I once measured close to 130 when I was living in Evansville. Higher line voltages will also translate into higher voltages in your set.

284V on the RF tube plate is not surprising. When I was working on my Model 370 last year, I measured 280 volts on its RF, 1st detector and IF tube plates. Philco specs call for 250V on the plates of those tubes. As for the cathodes, I measured 3V on the RF, oscillator and IF cathodes; 7V on the 1st detector (mixer) tube. The front end of the 70 is the same as the early 90 front end. I was using chassis ground as common.

But 247V on the detector plate? That does sound quite high! Have you checked resistors (23) and (34)? Both 250K, 1/2 watt. And what about the 2nd detector cathode resistor (21)? 50K, 1/2 watt. If these check OK, then check your B-C resistor (38).

Try measuring again, using B- as your common point, and see what the difference is. You will probably read close to published specs on the cathodes by doing this.