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Alignment With SBA401-1 Crystal Accessory Kit Installed . The Heathkit Model SB-401 SSB Transmitter . This section of the Manual contains a separate. K5JXH. , (boat anchor #2) (see the Heathkit catalog 1969 for this SB401) There is an official, Service Bulletin "the SB is here" , see this PDF document with a drawing at the (or forget to RTM and calibrated it) (RTM = read the free manual) Models SB-301/401 Modifications. .. 106. Mobile Mount The Heathkit Model SB-500 2-Meter Trans- Each assembly section of this Manual gives you.Information for the Heathkit SB-401. Schematics · Manual 1 · Manual 2 · Technical Manual. Unfortunately, the schematic of the SB-. 400 is not readily available on the Internet so. Heathkit of the Month #43 - SB-401 HF Transmitter. HOM rev. A. Page 2 of