04-27-2017, 09:29 PM
Thanks Mondial - I came to the same conclusion about the schematic after looking at the tabs on the rear of the 1st section of the bandswitch. Pins 8 and 9 are indeed connected when the switch is in the BC position, which results in the antenna coil being connected to C412. I didn't want to conclude that the schematic was wrong since I have two different schematics and they both show it that way. But now that I've done that checking and you've concurred, I'll move on ;)
Tonight I just did a whole bunch of bugging. It seems like either something is disconnected somewhere or something is shorted to ground that shouldn't be. So I spent a lot of time measuring resistance from every connection on the bandswitch to ground. It can be difficult to determine if the reading is accurate since many are connected to coils which are connected to ground. But for each connection I verified that the reading I got at least seemed reasonable. I also did that with many of the tabs on terminal strips. I've taken the voltage and resistance readings on all of the tube sockets and compared them to the expected values and all seemed reasonable. Other than the resistance readings on the filament pins...I assume they are way off because I'm using a DMM as opposed to a 20,000 ohm/volt VOM.
This is starting to worry me. It's starting to look like one of those things that will make me slap my forehead when I figure it out because it was something dumb I did lol.
Rich
Tonight I just did a whole bunch of bugging. It seems like either something is disconnected somewhere or something is shorted to ground that shouldn't be. So I spent a lot of time measuring resistance from every connection on the bandswitch to ground. It can be difficult to determine if the reading is accurate since many are connected to coils which are connected to ground. But for each connection I verified that the reading I got at least seemed reasonable. I also did that with many of the tabs on terminal strips. I've taken the voltage and resistance readings on all of the tube sockets and compared them to the expected values and all seemed reasonable. Other than the resistance readings on the filament pins...I assume they are way off because I'm using a DMM as opposed to a 20,000 ohm/volt VOM.
This is starting to worry me. It's starting to look like one of those things that will make me slap my forehead when I figure it out because it was something dumb I did lol.
Rich