SOURCE: Heathkit 10-4105 user manual
A company recently purchased the rights to all Heathkit copyrighted data, so all free manual copies and downloads have been withdrawn from the web. I found an original for sale at the link below, but it'll cost you $34!
http://www.vintagemanuals.com/manual.php?manufacturer=Heathkit&model=IO-4105
Bill B
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