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SB200 Heathkit and Collins 30L-1 Bias System Improvements

SB200 Heathkit Collins 30L-1 Arc and Fault Protection

Our Kits and Products

SB200 Heathkit Relay Buffer Install and URB200BMK

AL811 and AL811H Fan Modification (Rev0)

AL811 and AL811H Upgrade Kit Manual (Rev1)

AL1500 and QSK Filter Capacitor  Additional Instructions

AL1200 AL1500 AL82 F33 Filter capacitor board install

 

HV TESTER Instructions

 

Vacuum Tube Operation (we sell vacuum tubes)

Designing Thoriated Tungsten Filaments

EIMAC CPI FILAMENT LIFE MANAGEMENT

Thoriated Tungsten Filament Operation