03-19-2015, 09:04 PM
Added the power cord, put all the tubes back and wired in the speaker. The dial scale needs some work to flatten it out but that's for later...here's the finished under chassis and the topside.
[Image: https://www.dropbox.com/s/s9bza5iscoi7pg....jpg?raw=1]
[Image: https://www.dropbox.com/s/58nm69se3irr1l....jpg?raw=1]
Dim bulb showed no shorts but ramping up the voltage brought nothing except the pilot lamp and the 42 filaments ....hmmm. Deoxit and pipe cleaner on the tube sockets and some cleaning of the tube pins gave better results...some crackling and humming of the speaker. Voltages readings noted below:
[Image: https://www.dropbox.com/s/1x78i2qhume537....png?raw=1]
The 75 tube failed when tube tested on the grid cap so one is on order. Thought I'd try it anyway. Is that causing the negative voltages on the CG to K line? (Power input is at 110v ac)
I thought I had checked the coils but decided to check the antenna coil and when I measure ANT to GND I get an open .
(rechecked other coils and they ohm out OK ) Maybe I damaged the coil during derusting, recap etc.?
[Image: https://www.dropbox.com/s/7rh0trk69vm8kt....jpg?raw=1]
When I measure from the ANT lug to one side of the #1 (10k) resistor located on the Band Switch I get 11ohms but from that point to GND is open so the 0.7 ohm section of the coil must be what is open. Does that sound right to you guys?
[Image: https://www.dropbox.com/s/s9bza5iscoi7pg....jpg?raw=1]
[Image: https://www.dropbox.com/s/58nm69se3irr1l....jpg?raw=1]
Dim bulb showed no shorts but ramping up the voltage brought nothing except the pilot lamp and the 42 filaments ....hmmm. Deoxit and pipe cleaner on the tube sockets and some cleaning of the tube pins gave better results...some crackling and humming of the speaker. Voltages readings noted below:
[Image: https://www.dropbox.com/s/1x78i2qhume537....png?raw=1]
The 75 tube failed when tube tested on the grid cap so one is on order. Thought I'd try it anyway. Is that causing the negative voltages on the CG to K line? (Power input is at 110v ac)
I thought I had checked the coils but decided to check the antenna coil and when I measure ANT to GND I get an open .
(rechecked other coils and they ohm out OK ) Maybe I damaged the coil during derusting, recap etc.?[Image: https://www.dropbox.com/s/7rh0trk69vm8kt....jpg?raw=1]
When I measure from the ANT lug to one side of the #1 (10k) resistor located on the Band Switch I get 11ohms but from that point to GND is open so the 0.7 ohm section of the coil must be what is open. Does that sound right to you guys?
