[ARC5] BC-453B Osc. Coil slug

[Waldo Magnuson]

  I'm still trying to get my dial calibration reading a little closer on my BC-453B.  I don't seem to be making much progress.  One of the problems is alignment at the low frequency (210 kc).  The lowest I can get is 217 or so.  I've measured capacitances and tried two other coil sets (courtesy of David Stinson, thanks Dave) and finally again got into the oscillator coil.  I measured the inductance (150 uh) and adjusted it to 135 uh ( I went the wrong direction, my thinking was wrong), I tried re-alignment and discovered my error.  But when I again tried to adjust the inductance (I have a Tek LC meter) the inductance was way low, something must have happened to the iron slug.

  So, not wanting to tamper with the other coil sets, does anyone have a "spare" slug?  Or maybe a suggestion for a coil slug material?  With my LC meter I can adjust inductance very accurately.

Skip Magnuson W7WGM
Spokane, WA