Ham Radio Stuff from The Mule.
R390 3TF7 Ballast Tube Solid State Replacement.
Converter to power GRC-9 Receiver or similar tube radios
12.6V 25A Power Supply From Microwave Oven Transformer.
Matching 75 Ohm coax to 50 Ohm loads.
Some design tools and other misc stuff, mostly in Excel.
Converting Switch-Mode Power Supplies To Power Vacuum Tube Equipment.