03-07-2013, 07:20 PM
I recaped and repaired a Philco 38-10. It works fine, except for a non-functioning short wave antena screw terminal. When I hook the 20 ft. antena wire to this terminal, it does no good. However, I get short wave reception when I hook to the AM terminal! The AM terminal also works for the AM band. Everything is conected under the chassis.
For what it's worth, I replaced the 70k ohm resistor with a 39k ohm one, as I understand Philco did after production was underway. (Philco used a 40k ohm resistor, but at 20% tolorance, I see no real difference.) The Rider publication mentions no other accompaning changes. This resistor is part of the short wave receaving circuit, but I can't see how that could cause the disfunction I am experiencing.
If a little solder got down the capacitor terminal when I attached the aforementioned resistor, could that cause such a problem? I presently have no way of testing capacidence. Now that I've got myself thinking about it, I could check that terminal for an open or a ground, but I will wait to hear what the Phorum has to say about this before proceeding further, as it is now fully assembled.
For what it's worth, I replaced the 70k ohm resistor with a 39k ohm one, as I understand Philco did after production was underway. (Philco used a 40k ohm resistor, but at 20% tolorance, I see no real difference.) The Rider publication mentions no other accompaning changes. This resistor is part of the short wave receaving circuit, but I can't see how that could cause the disfunction I am experiencing.
If a little solder got down the capacitor terminal when I attached the aforementioned resistor, could that cause such a problem? I presently have no way of testing capacidence. Now that I've got myself thinking about it, I could check that terminal for an open or a ground, but I will wait to hear what the Phorum has to say about this before proceeding further, as it is now fully assembled.
