Heathkit IG-42 Laboratory Generator – Initial Checkout

I hooked up the Heathkit IG-42 Signal Generator to the variac on the bench and brought the voltage up slowly, watching for signs of overheating or failed components.  There was a slight hum coming from the unit for the first couple of minutes, then it got better.  I suspect that the electrolytic capacitors were recovering after having not been in use for some time.

The IG-42 is rated for 100,000 uv output, with a 50 ohm output impedance.  To check this against a known good source, I set up my HP 8640B signal generator for 0.1 volt output into the 50 ohm terminated input of my scope.  0.1 volt = 100,000 uv.

8640B Check Scope Calibration

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Heathkit IG-42 Laboratory Generator – First Look

A friend and colleague of mine asked me to take a look at his Heathkit RF Signal Generator: IG-42.  The only information I got from him about it was that he had inherited it from a good friend, and had not had much luck using it.

Here we will make our initial inspection of the unit, and try to get a feel for what work might be needed to restore it to a useful condition.

Front View as received

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Heathkit C3 Condenser Checker – Wrapup

Finally, I just wanted to demonstrate the operation of the C3 Condenser Checker.  I’m not much of a videographer, but here is my video demonstrating the device to check several good and bad capacitors for value and leakage. Enjoy!

 

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Heathkit C3 Condenser Checker – Knob Repair

Almost finished…

A final repair on the knobs of the Heathkit C3 Condenser Checker, and it will be ready for operation.

Epoxy

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Heathkit C3 Condenser Checker – 25 Volt Mod

As noted in my previous post, the 25 volt scale for the leakage test function of the Heathkit C3 Condenser Checker provided a voltage that was considerably higher than 25 volts.  It was closer to 50 volts.  This seems to be a design flaw, or a documentation flaw, as I don’t know which side of the team dropped the ball.  I chose to treat it as a design flaw, since the documentation and the front panel screen printing indicated that it should be a 25 volt scale.

25 Volt Mod in place

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