High Voltage DC to DC Supply Evaluation
The high voltage supply for the vacuum tube transmitter needs to be low noise in the 40 meter band, efficient for battery operation and...
High Voltage DC to DC Supply Evaluation
T/R Switch and QCX Interface and Modification
Single Tube SOTA Transmitter
Vacuum Tube, Battery, Lightweight, Compact, Portable: Can They Coexist?
The Digi-Disco, a 1970's Light Controller
Heathkit IT-28 Capacitor Checker