A complete listing of all available Peter Dahl amateur and commercial transformers and chokes A link to the Harbach Electronics, LLC Custom Transformer Quotation Form is also available from this page. Parts and upgrade kits for the Heathkit SB-220 & SB-221 series of amplifiers. This section includes power supply kits, fans, soft-key modules, soft-start modules and T/R relays. Parts and upgrade kits for the Heathkit SB-200 & SB-201 series of amplifiers. This section includes power supply kits, fans, soft-key modules, soft-start modules and T/R relays. Parts and upgrade kits for the Drake L-4/L-4B/L-7 series of amplifiers. This section includes power supply kits, soft-key modules, soft-start modules, replacement power supply safety resistors and replacement bias resistors. Parts and upgrade kits for the Collins 30L-1 amplifier and 516F-2 Power supply. This section includes power supply and solid-state modification kits Parts and upgrade kits for the Dentron amplifiers. This section includes power supply kits for the Clipperton-L. Upgrades for other amplifiers in the Dentron line are in development (MLA-2500, GLA-1000 and Clipperton-V). Information concerning the W8ZR StationPro series of master station controller kits. | 
