09-19-2015, 10:18 PM
Neither of the models you mention had a factory phono input. Based on your description, I think you might be looking at the three-pin external antenna input jack. It doesn't have a number on the schematic, but it is a kind of oval-shaped symbol with three holes directly over the words "84 uuf" for capacitor #9. On the schematic it is wired as you describe.
This connector was for an optional Philco device for owners who wanted to use an external wire antenna instead of the internal loop. It looked like an IF can with a switch on the top and three pins on one side to go into the three-hole socket you mention. Inside was (I think) a coil and a capacitor to match the impedance of either the internal loop or an external wire, depending on which direction the switch was set. I think there must have been screw terminals on the rear side to attach a wire antenna.
Every now and then you see one on eBay for sale with one of the 41-2xx series of radios. There have been a couple of threads in the Phorum with pics of the device, and Ron posted a hand-drawn schematic of the insides.
RCA type connectors were commonly used to connect audio equipment, so they were used for aftermarket phono inputs on radios. The iPod matching device shown on Phil Nelson's page will plug into an RCA jack very similar to those used then. Marcus and Levy have several suggested designs in their book.
Do you know about low-power AM transmitters? Many of us on this Phorum use them to broadcast whatever we want to hear on our radio collections. There are several on the market, usually kits, from $35 or so and up. Most agree that the $100 SSTRAN is about the best, and easy to build. www.sstran.com
I set mine up in the basement with an old stereo amp and tuner, a cd player, and an old laptop. The amplifier's headphone output is plugged into the transmitter. I can listen to just about anything I want that way (and so can my neighbors up to about 1/2 block away!) You could just plug your iPod's headphone jack into the transmitter, and it would sound much the same as if you built the adaptor box and phono input.
Either way you want to go would be a fun project.
This connector was for an optional Philco device for owners who wanted to use an external wire antenna instead of the internal loop. It looked like an IF can with a switch on the top and three pins on one side to go into the three-hole socket you mention. Inside was (I think) a coil and a capacitor to match the impedance of either the internal loop or an external wire, depending on which direction the switch was set. I think there must have been screw terminals on the rear side to attach a wire antenna.
Every now and then you see one on eBay for sale with one of the 41-2xx series of radios. There have been a couple of threads in the Phorum with pics of the device, and Ron posted a hand-drawn schematic of the insides.
RCA type connectors were commonly used to connect audio equipment, so they were used for aftermarket phono inputs on radios. The iPod matching device shown on Phil Nelson's page will plug into an RCA jack very similar to those used then. Marcus and Levy have several suggested designs in their book.
Do you know about low-power AM transmitters? Many of us on this Phorum use them to broadcast whatever we want to hear on our radio collections. There are several on the market, usually kits, from $35 or so and up. Most agree that the $100 SSTRAN is about the best, and easy to build. www.sstran.com
I set mine up in the basement with an old stereo amp and tuner, a cd player, and an old laptop. The amplifier's headphone output is plugged into the transmitter. I can listen to just about anything I want that way (and so can my neighbors up to about 1/2 block away!) You could just plug your iPod's headphone jack into the transmitter, and it would sound much the same as if you built the adaptor box and phono input.
Either way you want to go would be a fun project.
John Honeycutt
