07-11-2025, 07:49 AM
Hi Phil,
Other than polarity of any electrolytic caps filtering the primary, before the rectifier, It should not matter if the radio was positive or negative ground. Most 6V car electrical systems between Post-WWII and the conversion were positive ground. When I was a kid, I found radios like this at the landfill (in the late 60s and early 1970s, they landfilled cars here), I ran these off of 6V AC and they would work just fine.
You may get away with almost any power transformer from a Philco 6V car radio that uses a 7Y4, 6X4 or 6X5 rectifier. In addition, other than permeability tuning as opposed to capacitor tuning, the circuit in this radio is likely to be similar to any 6 tube transformer powered radio, except for the fact that many Philcos had a somewhat lower B+ (165-180V) as opposed to 250V for many other transformer powered radios. Confirm this from your schematic.
Other than polarity of any electrolytic caps filtering the primary, before the rectifier, It should not matter if the radio was positive or negative ground. Most 6V car electrical systems between Post-WWII and the conversion were positive ground. When I was a kid, I found radios like this at the landfill (in the late 60s and early 1970s, they landfilled cars here), I ran these off of 6V AC and they would work just fine.
You may get away with almost any power transformer from a Philco 6V car radio that uses a 7Y4, 6X4 or 6X5 rectifier. In addition, other than permeability tuning as opposed to capacitor tuning, the circuit in this radio is likely to be similar to any 6 tube transformer powered radio, except for the fact that many Philcos had a somewhat lower B+ (165-180V) as opposed to 250V for many other transformer powered radios. Confirm this from your schematic.
"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
"Let us begin to do good"- St. Francis
Best Regards,
MrFixr55
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