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Author Topic: Heathkit IG-72 restoration  (Read 3903 times)

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Offline jcrubinTopic starter

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Heathkit IG-72 restoration
« on: January 03, 2017, 01:31:03 pm »
This thread contains information about the restoration of my Heathkit IG-72 audio generator








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Offline bitseeker

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Re: Heathkit IG-72 restoration
« Reply #1 on: January 05, 2017, 01:39:24 am »
Thanks for the walkthrough. I hadn't seen inside one of these before. Looking forward to seeing what that switch mod does.
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Offline jcrubinTopic starter

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Re: Heathkit IG-72 restoration
« Reply #2 on: January 09, 2017, 01:42:47 pm »
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Offline jcrubinTopic starter

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Re: Heathkit IG-72 restoration
« Reply #3 on: January 24, 2017, 12:59:11 pm »
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Offline bitseeker

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Re: Heathkit IG-72 restoration
« Reply #4 on: January 25, 2017, 04:39:02 am »
Nice restoration. Thanks for sharing, JC.
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Offline jcrubinTopic starter

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Re: Heathkit IG-72 restoration
« Reply #5 on: January 21, 2018, 02:29:15 am »
It broke this evening...... troubleshooting underway!!
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Offline jcrubinTopic starter

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Re: Heathkit IG-72 restoration
« Reply #6 on: March 12, 2018, 01:00:59 pm »
Here is the troubleshooting and repair for this unit, with a slight modification to ensure that this never happens again.



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Offline akimmet

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Re: Heathkit IG-72 restoration
« Reply #7 on: March 13, 2018, 04:00:25 am »
The big power resistor resistor burning out was also the cause of death for my blue face Eico 377. Eico used a 10K 10W resistor (R15), I replaced mine with 2 20K 10W in parallel.
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Offline jcrubinTopic starter

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Re: Heathkit IG-72 restoration
« Reply #8 on: March 14, 2018, 01:41:36 am »
Even as I worked on it the first time I knew it couldnt be good.  the heat cycles for that resistor meant a certain end.  Granted, it did last 60 years, so theres that.
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