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Heathkit SG-18A signal generator schematic needed

Silverface

Silverface

New Member
Looking for a schematic for a Heathkit SG-18A signal generator.

Does have to be the "A" model schematic.

It is a commercial / retail audio signal generator that was made by Heath/Schluberger.

Any help would be much appreciated.
 
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Thanks Tom, great site!
That was fast. However, I have the IG-18 schematics and my
unit runs but what I want to find out is what improvements were
made in the "A" model.
The advanced model is supposed to have lower distortion,
better regulation, and overall improved stability.

Can anyone confirm this?
 
HEATHKIT IG-18, IGW-18, SG-18A, IG-5218 & SG-5218 Audio Generator

Sorry, but the black and white SG-18A is simply a factory built IG-18 (Heath never used IG-18A as a model #). Both IG-18 and SG-18A were produced concurrently between approx 1972 and 1977. No circuit, parts or specs differences between these two generators. The wired unit between 1968 and 1972 was identical to the beige IG-18 and named IGW-18. Later both units were white and blue and called IG-5218 and SG-5218. As far as improvements, they were few and far between, every 4 years or so and the specs showed no significant changes until Heath's demise.
Unfortunately some people will post inacurracies on the internet and simply refuse to make corrections even after promising to do so. Such is the case of Hans Gatu of Sweden www.heathkit.nu who have declared:
«The Sine/Square Wave Audio Generator IG-18 came on the market in 1969 and was produced until 1975. It was then improved and launched as the IG-18A in 1975, which in turn was replaced by the IG-5218 in 1977. The IG-5218 was produced until 1990. They were all very similar. The difference between the IG-18A and the IG-5218 mostly is about a new look and color».
This is an innacurate story that have been on top of the google search for many years now and he won't make the necessary corrections!
Thanks
 
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I think there was an IG-18 upgrade article in The Audio Amateur magazine many years ago. Can't think how to find it...
 
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