Download Files Page
This page is for manuals and technical papers
Ameritron AL572 Amplifier Factory Error Corrections for relay system and reliability (pdf format)
AL80B, AL572, AL800, AL800H relay timing, bias, and arc protection mods (pdf format)
AL811H 2014 board 4F (Caution using MFJ parts number list!)
Ameritron GOP and Timer Overload
Ameritron ALS606 ALS1300 ALS1306 Fan Speed
Ameritron AL1200 Relay AL1500 Relay AL82 Styles
Bandswitch wiring and replacement (pdf format)
SB200 Heathkit and Collins 30L-1 Bias System Improvements (pdf format) rev 4
SB200 Heathkit Collins 30L-1 Arc and Fault Protection rev2 (pdf format) updated 10 May 2023
Our Kits and Products
AL80B, AL572, AL800, and AL800H Factory Error Correction AL8X Kit
Latest AL811 Fan Kit with Circuit Board (released Sept 2024)
AL811 AL811H Cooling Fan Kit (Be Cool kit) with two loose Zener bias diodes PDF File
Fan Mod AL811 AL811H (Rev 1) PDF file
AL811 and AL811H Upgrade Kit Manual (Rev3A modified April 3, 2024)
AL811 AL811H TPS3 TPS4 parasitic suppressor upgrade instructions pdf file
AL1500 and QSK Filter Capacitor Additional Instructions (old)
AL1200 AL1500 AL82 UNSS Step Start
AL1200 AL1500 AL82 F33 Filter capacitor board install (old)
AL1200 AL82 AL1500 F33-4500 Filter Capacitor boards PDF file instructions (latest)
AL1200 AL82 AL1500 UNRS Universal replacement antenna relay instructions
AL82 AL1200 TOF Install
Collins 30L-1 Parasitic Suppressor
Dentron Clipperton Choke and Suppressor Installation Manual link pdf file
Heathkit SB200 Heathkit Relay Buffer Install and URB200BMK
Heathkit SB200 SB220 Relay Installation Heathkit K1 69-55 relay, Heathkit 69-5 relay Install
Heathkit SB220 Filter Capacitor Board instructions revised July 12, 2024
Heathkit SB220 Rectifier Bias Metering Board
SB220 Relay Buff Internal UNRB220 Install
Kenwood X54-1300-10 pdf
Relay Installation OEM Style Ameritron AL80, AL80A, AL1200, AL1500, AL82 and SB-1000 Heathkit
TOF Installation current files (Aug 1, 2022)
TOF Install AL82 AL1200
TOF Install AL811 series
UNSS (soft-start step-start) Generic Installation
Vacuum Tube and Amplifier Operation
(we sell vacuum tubes)