Crystal Calirators

Heathkit HD-20, 100 kHz Universal Crystal Calibrator, for Parts or Repair #3  This calibrator does not have the 100 KHz crystal. I tested it with a good crystal and it is working, and you can hear the tone, but is a bit weak as compared to others I...

Heathkit HD-20, 100 kHz Universal Crystal Calibrator, in Excellent Working Condition #2  I tested this calibrator and it is working as it should with no problems and the 100 KC Crystal is strong and a scarce crystal to find.  This Calibrator...

Heathkit HD-20, 100 kHz Universal Crystal Calibrator, in Excellent Working Condition with Chrome Knob #1  I tested this calibrator and it is working as it should with no problems and the 100 KC Crystal is strong and a scarce crystal to find...