[Hallicrafters] SX-111 Calib. signal

Waldo Magnuson magnuson at mac.com
Fri Feb 13 20:45:50 EST 2004


I still can't find the problem with my SX-111 calibration signal 
oscillator.  I have:
1) Switched to a new 6AU6 tube - no effect.
2) Checked the crystal with a signal gen. and oscilloscope - there is a 
sharp resonance at 100.23 KHz.
3) Replaced both ceramic capacitors in the osc. module.
4) Checked the values of all resistors in the osc. module.
5) Carefully inspected all connections to the module.
and yet it doesn't oscillate.  The voltages I measure at V301 (6AU6) 
(Hallicrafters voltage chart are in () are:
p1. 0v (-36v), p2. 3.5v (6.4v), p3. 0v (6.3vac), p4. 6.7v (0v), p5.  
41v (66v), p6. 123v (94v), p7. 3.5v (6.4v).  Should I suspect the 
crystal although it checks ok?
If someone has a SX-111 and can easily measure the voltages I would 
appreciate it.  Thanks.
73,  Skip  W7WGM




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