Original Heathkit SSB Transmitter Model SB-401 Specifications Schematic 1968

Vintage Bird Instruction Book for Thruline RF Directional Wattmeter Model 43

Original Heathkit Scanalyzer Model SB-620 Specifications Schematics 1969

Instruction Book for BIRD Model 43 RF Directional Thruline Wattmeter

Heathkit Manual AG-8 AG-10 AR-3 C-2 C-3 G-5 IG-102 IM-21 LG-1 SG-8 V-4 V-7A

HeathKit Assembly Manual Reflected Power Meter & SWR Bridge HM-15

1984 Instruction Book for BIRD Model 43 RF Directional Thruline Wattmeter

Heath Kit Audio Vacuum Tube Wattmeter Model AW-1 Construction Manual