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 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). Parts and upgrade kits for other amplifiers inclusing the Heathkit HL-2200. This section includes electrolytic capacitors, universal soft-start moduless, replacement bumper feet and other parts. This section highlights new product offerings from Harbach Electronics. | 
