On 6/30/2021 8:31 AM, Mark - N5OT wrote: > I think I will leave the 1N4003 in there for the time being, but when I > find a 1N4001 I'll set it aside for the next time I open the box. The difference between diodes in the 1N400x range is their PIV rating, with x being the highest rating (1kV). They're all 1A Si diodes. 73, Jim K9YC