10-13-2014, 04:23 PM
I took a look at it this morning, and determined the only possible way to get those two caps was to separate the band switch dividers from the top of the RF chassis.doing so is the only way to get these caps out from inside the coils. here is the view once you separate the top of the RF chassis from the band switch dividers. This is the only way these can come out.
But even then, it's still a bear to get to the top lead. On one I was able to get my smallest pair of side cutters in there between a couple coils. but just barely. The other I had to take an exacto knife and slowly hack away at the lead till it cut it. Then I could carefully get my iron in between the coils to get to the new ones soldered in place.
I buttoned the RF chassis back up, put it back in the main chassis, and reconnected the wiring. Before putting the rectifier in, I went through again and made sure all the filaments were reading correctly. I put just the rectifier in, and put my DMM across the filter caps and transformer CT. I slowly brought it up on the variac, and watched B+ as I brought it up. Also kept an eye on my ammeter. Everything looked good, so I put all the tubes and shields back in. Brought it up slowly again on the variac, B+ was holding steady around 360v (schematic says 370), and it was drawing about 1.1A through the variac.
But I don't get anything on any of the bands. Can't tell what band I'm on as i have thethe dial and band mask off. Using my signal generator, I set it to 470 and injected the signal into the grid cap of the mixer. I can hear it accross all bands. I then set my sig gen to 600, and injected to terminal #1 on the back. I could pick it up with the band switch all the way counter clockwise, and in a certain spot on the tuning cap. But its fairly quiet, and the volume doesn't increase until I get near the upper end of the volume pot. Then it starts getting louder.
Normally at this point, I'd go around and check voltages on the tubes. But that is going to be impossible on any in the RF chassis. So I'm at a loss right now.
But even then, it's still a bear to get to the top lead. On one I was able to get my smallest pair of side cutters in there between a couple coils. but just barely. The other I had to take an exacto knife and slowly hack away at the lead till it cut it. Then I could carefully get my iron in between the coils to get to the new ones soldered in place.
I buttoned the RF chassis back up, put it back in the main chassis, and reconnected the wiring. Before putting the rectifier in, I went through again and made sure all the filaments were reading correctly. I put just the rectifier in, and put my DMM across the filter caps and transformer CT. I slowly brought it up on the variac, and watched B+ as I brought it up. Also kept an eye on my ammeter. Everything looked good, so I put all the tubes and shields back in. Brought it up slowly again on the variac, B+ was holding steady around 360v (schematic says 370), and it was drawing about 1.1A through the variac.
But I don't get anything on any of the bands. Can't tell what band I'm on as i have thethe dial and band mask off. Using my signal generator, I set it to 470 and injected the signal into the grid cap of the mixer. I can hear it accross all bands. I then set my sig gen to 600, and injected to terminal #1 on the back. I could pick it up with the band switch all the way counter clockwise, and in a certain spot on the tuning cap. But its fairly quiet, and the volume doesn't increase until I get near the upper end of the volume pot. Then it starts getting louder.
Normally at this point, I'd go around and check voltages on the tubes. But that is going to be impossible on any in the RF chassis. So I'm at a loss right now.
