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SB200 Heathkit and Collins 30L-1 Bias System Improvements  (word)

SB200 Heathkit and Collins 30L-1 Bias System Improvements (pdf format)

SB200 Heathkit Collins 30L-1 Arc and Fault Protection

Our Kits and Products


Kenwood X54-1300-10 pdf

SB200 Heathkit Relay Buffer Install and URB200BMK

Fan Mod AL811 AL811H (Rev 1) PDF file

Fan Mod AL811 and AL811H(Rev0) word doc

AL811 and AL811H Upgrade Kit Manual (Rev2)  Updated AUGUST 2022

AL1500 and QSK Filter Capacitor  Additional Instructions (old) 

AL1200 AL1500 AL82 F33 Filter capacitor board install (old)

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

HV TESTER Instructions

TOF Installation current files (Aug 1, 2022)


Vacuum Tube Operation

(we sell vacuum tubes)

Designing Thoriated Tungsten Filaments


Thoriated Tungsten Filament Operation