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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)

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) 

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

Fan Mod AL811 AL811H (Rev 1) PDF file

Relay Installation OEM Style Ameritron AL80, AL80A, AL1200, AL1500, AL82  and SB-1000 Heathkit

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 Step Start

AL1200 AL1500 AL82 F33 Filter capacitor board install (old)

AL1200 AL82 AL1500 F33/F54 PDF file instructions (latest)

AL1200 AL82 AL1500 Antenna Relay T/R 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

HV TESTER Instructions


Kenwood X54-1300-10 pdf


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)


QST 1991 September Technical Correspondence re: The Nearly Perfect Amplifier

Designing Thoriated Tungsten Filaments


Thoriated Tungsten Filament Operation`

Getter Materials (used to degas vacuum tubes)