06-28-2016, 04:15 PM
Schematic Link
Brought the set up to voltage slowly with variac and the voltage on the 200uF cap went to 8.1 v so all OK there I think. I got a bit of static on the speaker but nothing tunes in and I get no tone when I put the signal generator on 455kc with modulation to pin 1 of 1LC6 (converter) and the radio tuned to 600kc (step 1 o the alignment procedure).
Voltage measurements around the tubes were:
[Image: https://www.dropbox.com/s/wdp1vnfd6cck7y....jpg?raw=1]
The tubes should all be good, I just got them from Bob Dobrush (and I find my tube tester has the same disease that sam's does in that it seem to fry the filaments for these when I test them
) . The "unstable" label means I'm seeing the voltage jump around on the digital meter, never getting a stable reading. I do get an increase in static when I put the meter probe on the plate of the det. amp 1LD5 to get that unstable reading.
I'm not quite sure what to look for next. Any thoughts???
[edit-this post was updated to revise the voltage chart after Terry helped me sort out the ILD5 Det. Amp voltage problem. so voltage are reasonable but still no tone]
Brought the set up to voltage slowly with variac and the voltage on the 200uF cap went to 8.1 v so all OK there I think. I got a bit of static on the speaker but nothing tunes in and I get no tone when I put the signal generator on 455kc with modulation to pin 1 of 1LC6 (converter) and the radio tuned to 600kc (step 1 o the alignment procedure).
Voltage measurements around the tubes were:
[Image: https://www.dropbox.com/s/wdp1vnfd6cck7y....jpg?raw=1]
The tubes should all be good, I just got them from Bob Dobrush (and I find my tube tester has the same disease that sam's does in that it seem to fry the filaments for these when I test them
) . The "unstable" label means I'm seeing the voltage jump around on the digital meter, never getting a stable reading. I do get an increase in static when I put the meter probe on the plate of the det. amp 1LD5 to get that unstable reading.I'm not quite sure what to look for next. Any thoughts???
[edit-this post was updated to revise the voltage chart after Terry helped me sort out the ILD5 Det. Amp voltage problem. so voltage are reasonable but still no tone]
