My type 2a Nixie clocks are a simple extension of my type 1a design to two tubes. The only significant new feature is optional lead zero blanking for appropriate values (hours in 12 hour format, month, and day). There is a new test/demo mode that displays all digits on both tubes (00, 11, 22, ... 99), but this is mainly for my own use in initially configuring the clock, and taking pictures for the animated mockup.

General features of type 2a clocks:

The first clock of this type I built has the following specific features:
JavaScript animated clock mockup
Here's a mockup of what the clock actually looks like in operation.