[Milsurplus] BC-221-AK Suggestions wanted.

[John Hutchins]

Hello Listers -

A while back, purchased a BC-221-AK;  Yes I know its not worth its 
weight.  This is a tune up project to get back my soldering and circuit 
debugging skills back in order with out breaking something of more 
useful value.  So in this sense its worth the effort.

Problem 1 :
  Knob set screws will not loosen up an come out.
 
Problem 2:
  Low end of the Low Band is out of calibration.  What is interesting is 
the High end of the Low Band is tracking by the book.  Resistors are way 
out of spec. and need to be replaced.
 
Due to problem 1;  Did not replace resistor in the Crystal Oscillator 
circuit across the crystal.  Need to remove the Master Oscillator sub 
chassis.
Due in part to problem 1;  Did not replace any resistors in the Master 
Oscillator circuit on the Coils or the resistor/cap mounted on the band 
switch that feeds the Grid on the Master Oscillator.  To replace the bad 
components on the coils and coil switch I need to remove the knobs, 
Problem 1.

Thanks
Hutch

Some progress
Cleaned out all the mold.  Removed the mold from the calibration book.  
Put two applications of liquid wrench on knob set screws.  Checked tubes 
all sturdy.  Checked and replaced multiple resistors and 3 paper caps.  
Note all micas were good.  I was able to align the Crystal Oscillator, 
as is, using an uncalibrated signal generator, HP-8601A,  in 
combination  with a calibrated  frequency counter, Sencore.  I took 1.5V 
out of the Signal Generator to get an audible Beat Note against the 
Crystal Oscillator.  The crystal Oscillator is stable as a rock.