Projects › Battery Eliminator for Vintage Battery Sets
Battery Eliminator for Vintage Battery Sets
In designRadioPower suppliesRestoration
Last updated 30 September 2026
Battery receivers need a 2 V (or 1.4 V) filament supply, several HT taps and grid bias, and the original batteries are long gone. This eliminator provides all three, regulated and protected.
The portable version runs from a 6 V or 12 V battery through a slow 100 Hz 'solid-state vibrator', so there's no switching interference on long and medium wave. The mains bench version adds a Pico and OLED showing every rail at once, adjustable current trips, and a slow reform ramp for sets with long-stored electrolytics.
At a glance
| LT | 1.8 – 2.3 V or 1.2 – 1.45 V, up to 2 A, crowbar protected |
|---|---|
| HT | 3 taps, 30 – 150 V, current limited |
| Grid bias | 2 taps, 0 to −18 V |
| Supply | 6/12 V battery, or mains (bench version) |
Block diagram
Click a drawing to open it full size.
Documentation
The full design report, schematics and parts list will be published here once the project has been built, tested and filmed.