[Heath] IG -57A schematic received

[Kenneth G. Gordon]

Thanks, ALL of you who sent me the necessary information.

I bought the IG-57A off eBay for very little cost, since I needed the 
case/cabinet for another project.

However, when I received the unit and removed the rather grundgy top and 
bottom covers, I was very thoroughly amazed at the incredibly careful 
construction. In all the years I have been dealing with Heathkits, I have never 
seen such very high-quality work!

At first, I thought it was a factory-built job, but on closer inspection, it became 
very obvious that the original owner was the builder.

ALL wiring was laid out at right-angles, long runs were carefully laced, all 
solder joints were perfectly done, and the flux residue had been carefully 
cleaned off, probably with alcohol. There was not one single loose screw or 
no-solder joint in the entire unit. Leads from coaxes were at the absolute 
minimum, etc. And the original owner/builder had scratched his information 
in the top of the sweep-generator housing.

I was amazed!

Although such a unit has absolutely no use in my shop, I was very reluctant 
to take it apart until I had determined that there was nothing in it I could use 
for my next project, a "high-performance" crystal tester and evaluator.

>From the schematic, it became obvious that I could use the internal power 
supplies, the DC amplifier, and possibly the sweep generator.

Although the sweep-generator does not, in its present configuration, cover 
the frequency ranges I need for my favorite method for aligning receivers, 
the so-called "visual" method, it appears that it can be modified to do so, so I 
have very carefully dismantled and saved all the parts necessary for that.

Again, I thank everyone who sent me the necessary information.

vy 73,

Ken Gordon W7EKB