08-01-2019, 10:39 AM
Thanks Chas for the help.
I replaced the 400K volume control pot with audio taper with a 500K pot with some unknown special taper. It seems to work just fine now. I think I will open the old one to try and repair (just for the experience).
Of note: the original Philco volume control has one side of the pot grounded to the body of the control. So when it is attached to the chassis one side of the pot is grounded. With the replacment pot that is not the case... so at first it did not work -- took me awhile to figure that out. I ran supplemental ground to the appropriate leg of the replacement pot and it works just fine now. Perhaps that is common knowledge to the Philco Phorum gang.
I also bent the pins on the oscillator tube just slightly -- in hopes they would make better contact. So far that maneuver is working -- I will need to cycle the radio on and off numerous more time to know for sure since it was an intermittent problem.
Thanks again for the help.
John w.
I replaced the 400K volume control pot with audio taper with a 500K pot with some unknown special taper. It seems to work just fine now. I think I will open the old one to try and repair (just for the experience).
Of note: the original Philco volume control has one side of the pot grounded to the body of the control. So when it is attached to the chassis one side of the pot is grounded. With the replacment pot that is not the case... so at first it did not work -- took me awhile to figure that out. I ran supplemental ground to the appropriate leg of the replacement pot and it works just fine now. Perhaps that is common knowledge to the Philco Phorum gang.
I also bent the pins on the oscillator tube just slightly -- in hopes they would make better contact. So far that maneuver is working -- I will need to cycle the radio on and off numerous more time to know for sure since it was an intermittent problem.
Thanks again for the help.
John w.
