03-22-2016, 08:30 PM
Hi Rich,
A couple of things. Set your generator for 175kc connect output to the grid cap of the 24A mixer tube. Turn volume up and generator output so you can just here the signal. Adjust #15 and 17 for max tone heard from spkr. Now your IF is aligned.
Take a listen for the local oscillator. Set dial of 52 at 60 (600kc). Use another receiver to listen for the lo signal at 775. You can use a small transistor set near the 24Atube to listen with. The lo should produce a signal at 175kc above the dial setting. At 600kc on the dial lo is at 775kc with the dial set at 1000kc the lo is at 1175 you get the point.
It can be difficult to see a bad winding your better off using as ohm meter to do the looking for you. If the oscillator coil is open (common problem) you can measure the resistance from pin 4 of the 24A to the ungrounded side of #35 or 36. Should see a low resistance like 10 ohms or less. If not you'll need to rewind a small winding on the coil (it's easy)
http://philcoradio.com/tech/images/51.jpg
GL
Terry
A couple of things. Set your generator for 175kc connect output to the grid cap of the 24A mixer tube. Turn volume up and generator output so you can just here the signal. Adjust #15 and 17 for max tone heard from spkr. Now your IF is aligned.
Take a listen for the local oscillator. Set dial of 52 at 60 (600kc). Use another receiver to listen for the lo signal at 775. You can use a small transistor set near the 24Atube to listen with. The lo should produce a signal at 175kc above the dial setting. At 600kc on the dial lo is at 775kc with the dial set at 1000kc the lo is at 1175 you get the point.
It can be difficult to see a bad winding your better off using as ohm meter to do the looking for you. If the oscillator coil is open (common problem) you can measure the resistance from pin 4 of the 24A to the ungrounded side of #35 or 36. Should see a low resistance like 10 ohms or less. If not you'll need to rewind a small winding on the coil (it's easy)
http://philcoradio.com/tech/images/51.jpg
GL
Terry
