Heathkit manuals | Hifi Manuals Free: page 6. Heathkit-IG-18-Manual-2 pdf Heathkit-IG-28-Schematic Heathkit-IG-42-Schematic-2 pdf Heathkit-IG-62-This is the assembly and operating manual for the Heathkit IG-42 signal generator. Download HEATHKIT IG-42 LABORATORY SIGNAL GENERATOR SM service manual & repair info for electronics experts. IMFD= 1,000,000 MMF. 100 MA. *. FILTER CHOKE. $10. 14- ww. /4.3V. SCHEMATIC OF THE. HEATHKIT. LABORATORY TYPE. SIGNAL GENERATOR. MODEL IG-42. Heathkit IG 42 Schematic. This is the 1 pages manual for Heathkit IG 42 Schematic. Read or download the pdf for free. If you want to contribute,