01-05-2015, 10:03 AM
This is a 38-34 set that I just got in tonight. I've been playing with it all evening. Even after I recapped the entire audio section, the best I could get out of it was a good waveform going into the output tube, but a very distorted (tons of harmonics) output that was several dB below the input.
I found the primary problem with the radio itself by accident: the dial lamp. Without it, there are no filaments on either the mixer/oscillator nor the output tube. Talk about your dial light being critical... sheesh. I will need to find a proper dial lamp for this set. The Philco part number appears to be 34-2150. Is there anyone out there that can give me the voltage/current of this lamp? If I can't find one, I'll end up modifying the pilot lamp circuit and use a resistor to complete the filament string and simply wire the dial lamp into the 6V supply and put a 47 in the socket.
Also, I'm working from a schematic for the Code 125 set, which this one is not. I need to find out the proper code so I can try to find the proper service literature. As of right now, I'm running the B+ from my regulated power supply, because there is no output from the vibrator supply (filters are leaky at the very least). I would like to get the right literature to start with before I crack that open..
I found the primary problem with the radio itself by accident: the dial lamp. Without it, there are no filaments on either the mixer/oscillator nor the output tube. Talk about your dial light being critical... sheesh. I will need to find a proper dial lamp for this set. The Philco part number appears to be 34-2150. Is there anyone out there that can give me the voltage/current of this lamp? If I can't find one, I'll end up modifying the pilot lamp circuit and use a resistor to complete the filament string and simply wire the dial lamp into the 6V supply and put a 47 in the socket.
Also, I'm working from a schematic for the Code 125 set, which this one is not. I need to find out the proper code so I can try to find the proper service literature. As of right now, I'm running the B+ from my regulated power supply, because there is no output from the vibrator supply (filters are leaky at the very least). I would like to get the right literature to start with before I crack that open..
