[Diverted]

Hello all,

I have posted a bunch of questions here in recent days about my Philco 41-285. Thanks for all your help; this is the first Philco I've seen and apart from the rubber wiring it's been a pretty fun rebuild.
I am having a problem, however. I need help in correctly wiring in a line in.

I wired one in the other day the same way I have done in other radios: Tapping into the high side of the volume pot and ground.
This worked; I was able to play an auxiliary source in this manner. However, it caused a problem I have not seen in other radios. When I disconnected the auxiliary source (BUT left the auxiliary wiring in place) and attempted to listen to the radio, the signal was a lot quieter than it should have been. Once I completely emoved the line in from the volume/pot ground, the radio volume returned to normal. Here is the adapter that I plugged into the volume pot:
http://www.antiqueradio.org/iPodAdaptor.htm

Any idea why this problem occurred? Some sort of impedance mismatch? As I said I've run this adapter into other radios and never had this radio signal attenuation problem. Any ideas on fixing it would be much appreciated!

Thanks,

Ted