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The
Sine/Square Wave Audio Generator IG-18
came
on the market in 1969 and was produced until 1975. The assembled
version IGW-18
was replaced by the SG-18A
in the early 70's. They were
replaced by the IG-5218
in
1977 and was produced until 1990. They were
all very similar. The
difference between them is mostly about the look and color. The IG-18 / IGW-18 was brown and
beige colored, the SG-18A
was black and white colored and the IG-5218 was blue and white colored. In
the 1/1971 issue of The Audio Amateur
magazine there was this article The Greening of the IG-18 by
Reginald Williamson that described how to improve the performance of
the IG-18.
Also
Max Robinson
has a site where he
describes how to modify the IG-18
for ultra low distortion.
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