Philco 41-608 add AUX input thru Phono RCA Jack - Printable Version
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+--- Thread: Philco 41-608 add AUX input thru Phono RCA Jack (/showthread.php?tid=21627)
Philco 41-608 add AUX input thru Phono RCA Jack - chalupa13 - 09-11-2020
Hello, I just finished restoring Philco 41-608 Radio/BOL Phono. I've tried to keep it as much original as possible. Only replaced caps, few wires and resistors, everything works even the original BOL set up. But i would like to add AUX input without doing any additional modifications (i.e soldering switch and wires to existing volume pot). I was wondering if I can create a removable splitter for "RCA" like jack that's going into the chassis from phono and use that as an input for a music player, using stereo to mono modified cable of course. Here is schematic showing where rca jack connects to chassis. Also I call it RCA input but its actually smaller than regular RCA cable, so if someone could tell me what cable is it i would appreciate it as well? Thanks in advance.
RE: Philco 41-608 add AUX input thru Phono RCA Jack - Radioroslyn - 09-11-2020
I would use a small cap like .005-.01mfd connected the control grid of the 7c6. This will block any errant voltages from getting into your pickup or device. Got a pic of your connector?
RE: Philco 41-608 add AUX input thru Phono RCA Jack - chalupa13 - 09-11-2020
thanks, in the schematic there is already 0.006uF cap before the grid (actually it was changed to 0.003uF in a later model). the RCA cable connects to that cap. Would you know what cable Philco used to connect phono to the chassic i cant find that type of cable anywhere.
RE: Philco 41-608 add AUX input thru Phono RCA Jack - chalupa13 - 09-11-2020
here is the connector pic. Top is regular RCA bottom is my weird cable. Also both outer jacket and center pin are thicker on regular RCA.
RE: Philco 41-608 add AUX input thru Phono RCA Jack - Radioroslyn - 09-11-2020
Yes you are correct the bottom one isn't a rca connector it's an automotive antenna connector. On the BOL sets the lamp is powered by a rf signal derived from the local oscillator. That's why there's a tapped choke (54) in the circuit. I didn't realize that you were going to be plugging and unplugging.
RE: Philco 41-608 add AUX input thru Phono RCA Jack - RodB - 09-11-2020
That looks like a male plug for a 50s and 60s car antenna that plugs into the radio.
RE: Philco 41-608 add AUX input thru Phono RCA Jack - RodB - 09-11-2020
Yeah, what you said, Terry.
RE: Philco 41-608 add AUX input thru Phono RCA Jack - chalupa13 - 09-11-2020
Thanks guys that's what it was. just bought a Y splitter from Ebay for $5. I think it should work. I also tried hooking up with alligator clamps directly to the antenna cable and back to my rca input. Worked great. I think tapping directly into phono pre-amp is better than going thru AM audio path, since it cuts out all of the static.
https://www.ebay.com/itm/Car-Stereo-AM-FM-Antenna-Splitter-Y-Aux-Adapter-1-Male-2-Female-Plug-12/333306674368?hash=item4d9aa03cc0:g:nacAAOSw9D1eWIpM