07-14-2016, 12:02 PM
Back to the Zenith…
The voltages on all the tubes are now in line with what they should be but still no audio tone. I do get a buzzing sound when touching pin 6 of 1LD5 as Terry suggested, indicating audio stage is working. 1st step in alignment is feed pin 6 of 1LC6 with modulated 455kc with radio tuned to 600kc. Nada.
Plate of 1LC6 goes to the 1st IF transformer so I checked and found about 18 ohms on both sides of it (blue-red leads and green-black leads). On the 2nd IF transformer I get 17 ohms on the Blue-Red side and 450K ohms on the brown-green side. Looking at the schematic I think I should see something more like 47k for that brown-green side of the transformer. Does that sound right?
[Image: https://www.dropbox.com/s/iwp813pdl6txno....jpg?raw=1]
The voltages on all the tubes are now in line with what they should be but still no audio tone. I do get a buzzing sound when touching pin 6 of 1LD5 as Terry suggested, indicating audio stage is working. 1st step in alignment is feed pin 6 of 1LC6 with modulated 455kc with radio tuned to 600kc. Nada.
Plate of 1LC6 goes to the 1st IF transformer so I checked and found about 18 ohms on both sides of it (blue-red leads and green-black leads). On the 2nd IF transformer I get 17 ohms on the Blue-Red side and 450K ohms on the brown-green side. Looking at the schematic I think I should see something more like 47k for that brown-green side of the transformer. Does that sound right?
[Image: https://www.dropbox.com/s/iwp813pdl6txno....jpg?raw=1]
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