11-25-2007, 03:03 PM
Hello and welcome.
Philco did not publish a voltage chart for this model. Philco's service bulletins, like their radios, became rather chintzy from 1939 through 1942. (Philco's service information was VASTLY improved after the war...but I digress.)
The voltages you have recorded seem to be well within the ballpark. You should look in a tube manual to confirm, or one of the online tube manual sources such as Duncan Amps' Tube Data Search.
You should replace ALL paper and electrolytic capacitors when restoring a vintage radio. You have already replaced the electrolytics and some of the paper caps; for best performance and reliability, you should replace all remaining paper caps in this radio.
Take a large capacitor, say 0.1 uF or better. Hold one lead of the cap, and touch the other lead to the center terminal of the volume control. You should get a loud hum. If not, you have trouble in the audio circuitry. (Many will recommend touching the volume control terminal with your finger; I suggested using the cap between you and the control for safety, although there shouldn't be any significant voltage at the volume control.
You could remove the pushbutton assembly, but why would you want to? The pushbuttons are for you to set up AM stations, not SW. I have found that on the later Philcos, it is quite convenient to set up the pushbuttons to receive certain AM stations in my area. It would leave eight gaping holes in your set's escutcheon. Not to mention you need the eighth button to switch between regular AM and pushbutton tuning. You could wire it so that the eighth button is no longer required, but I strongly suggest you give that a second thought.
Philco did not publish a voltage chart for this model. Philco's service bulletins, like their radios, became rather chintzy from 1939 through 1942. (Philco's service information was VASTLY improved after the war...but I digress.)
The voltages you have recorded seem to be well within the ballpark. You should look in a tube manual to confirm, or one of the online tube manual sources such as Duncan Amps' Tube Data Search.
You should replace ALL paper and electrolytic capacitors when restoring a vintage radio. You have already replaced the electrolytics and some of the paper caps; for best performance and reliability, you should replace all remaining paper caps in this radio.
Take a large capacitor, say 0.1 uF or better. Hold one lead of the cap, and touch the other lead to the center terminal of the volume control. You should get a loud hum. If not, you have trouble in the audio circuitry. (Many will recommend touching the volume control terminal with your finger; I suggested using the cap between you and the control for safety, although there shouldn't be any significant voltage at the volume control.
You could remove the pushbutton assembly, but why would you want to? The pushbuttons are for you to set up AM stations, not SW. I have found that on the later Philcos, it is quite convenient to set up the pushbuttons to receive certain AM stations in my area. It would leave eight gaping holes in your set's escutcheon. Not to mention you need the eighth button to switch between regular AM and pushbutton tuning. You could wire it so that the eighth button is no longer required, but I strongly suggest you give that a second thought.
--
Ron Ramirez
Ferdinand IN
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