03-22-2009, 01:11 PM
Part no. 32-7018
65 henries, 2250 ohms, 10 mA DC (according to the 1941 Philco parts catalog). As the resistance across your choke is less than 20 ohms, it is pretty well shorted out. And you won't find a 65 henry choke these days!
You can substitute a 2200 ohm, 2 watt resistor for the choke, and increase the value of electrolytic (49) from 6 uF to 22 uF. This may solve your problem. Many 1937 Philco radios used a similar voltage divider network to feed B+ to the IF screen grid and the 1st det-osc oscillator "plate", but these used a resistor, not a choke, to drop the B+ somewhat and act as part of a "pi" filter which included input and output electrolytics, just as in the 66. I have not tried this in a 66 or a 45 (same voltage divider circuit), so YMMV...but theoretically at least, it should work.
65 henries, 2250 ohms, 10 mA DC (according to the 1941 Philco parts catalog). As the resistance across your choke is less than 20 ohms, it is pretty well shorted out. And you won't find a 65 henry choke these days!
You can substitute a 2200 ohm, 2 watt resistor for the choke, and increase the value of electrolytic (49) from 6 uF to 22 uF. This may solve your problem. Many 1937 Philco radios used a similar voltage divider network to feed B+ to the IF screen grid and the 1st det-osc oscillator "plate", but these used a resistor, not a choke, to drop the B+ somewhat and act as part of a "pi" filter which included input and output electrolytics, just as in the 66. I have not tried this in a 66 or a 45 (same voltage divider circuit), so YMMV...but theoretically at least, it should work.
--
Ron Ramirez
Ferdinand IN
