- 2024
- Oct
- 23
A Heathkit IG-72 Signal Generator Part 1 - Observations.
I’ve decided to see about tuning up this device I purchased at The Scioto Valley Hamfest, so this will be my next project. It shouldn’t be anywhere near as involved as the last one - but we’ll see.
You’ve probably seen this picture posted here a couple of times:
The device has an output, but it’s flat on one side. The oscillator is working, is fairly close - but is out of balance. This could be tubes, the light bulb PTC resistor, or a bad capacitor. That’s what we’re here to determine.
The device was purchased at a hamfest, as previously indicated. The vendor selling it had a bunch of odds n ends:
I bought this, and another unit the guy had. The second unit had a handle, and was in poor shape overall. It sacrificed it’s handle for the ‘good’ unit.
Since much of what I’ve read points to a tube being not-bad-not-good, I picked up a fresh set of tubes:
( I am a goofball and did not grab the internal shots. I’ll post those here as soon as I get them and write some things about the inside of the devices. )
Since things are working, I’m taking the time to do what I normally do with these things - take the half-loose knobs off and give them a bath:
They come out nice and clean. I’m cleaning the other unit’s knobs as well, no use in wasting time in the ultrasonic bath.
Next step is to open the device and check some things against the manual. Stay tuned!