| :::You won’t get anything at 455KC with the IF being so far off. Turn the attenuator up on the signal generator, then adjust the 2nd IF first. Then the first. When you start getting a signal though, turn the attenuation back down. ::: ::: ::Well tried as you suggested, had to start where I got a signal at 640, then kept turning the generator down about 10 kz at a time then adjusted the IF's till the signal came thru , kept doing that till I got down to about 590 and ran out of adjustment on the IF screws. but it did make a difference on the dial readings they are closer to where they should be. the high end my local station at 1440 is now at 1520 espn 1000 tunes in at 1100 alot closer than before . I must have a mica or something out to prevent the IF's from resonating at 455... guess I will start subing caps. :: :Hi Elton, : Can you get the second IF to tune to 455? There has to be something not right inside an IF can to cause that. : As a bizaar possibility the IF tube could have high plate to supressor grid capacitance. That is a really weird failure for a tube, though. If you have another IF tube you may want to try it, but I wouldn't order a tube for that reason because it is such an odd failure. : :Best Regards, : :Bill Grimm : I had to solder-blob an open litz wire coil once and it drastically detuned the coil. The blob repair effectively changed the length/distributed capacitance of the winding. If your coil wire is solid wire, it should do OK. Would adding or subtracting to the length of the coil winding help bring it back into band tune? - Walter. IPAddress: ***.44.136.25 |
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