Welcome to Project405
Construction projects for the vintage radio, television and amateur-radio workshop.
Here you'll find the designs, schematics, parts lists and bench notes behind a series of home-built projects: 405-line television, valve test gear, power supplies for battery sets, transmitters and antenna accessories. Each project is being written up so it can be built from the documents.
Latest projects
Bush TV22 Restoration: New Line Output Transformer
Bringing a 1950 Bush TV22 back to life when its line output transformer is beyond repair.
Bush TV12 Restoration: Replacing the Missing T4
The TV12's line output transformer is gone entirely; a new one is wound on a ferrite core, keeping the original EHT overwind.
Battery Eliminator for Vintage Battery Sets
LT, HT and grid bias for 1920s–30s battery receivers, from a 6 or 12 V battery or the mains.
Digital EHT Probe, 0–20 kV
A self-contained EHT probe that reads kilovolts directly on its own LCD, for 405-line TVs and CRT supplies.