Another Oltronix power supply – D400-007D
Another Oltronix power supply – D400-007D This is another 1960s-era laboratory power supply from Oltronix. This article provides an overview of the design and highlights key considerations when repairing or restoring the unit. To ensure reliable operation on modern mains voltages, several components require upgrading or replacement. Below is a screenshot from the original LABPAC 30-series product presentation: Front view. Rear view with the EL34 series pass element visible.