Once received I will send a confirmation message through the Kickstarter messenger!
Replacing a tube requires delicate desoldering to prevent damage to the circuit board and it is recommended that you have previous experience with soldering repairs. There is a max 2 tubes per order due to packaging constraints.
If you choose not to purchase an additional tube now, do not worry! My online store will be open for the foreseeable future with replacement tubes, and if a tube does burn out I would be happy to repair it for only the cost of the replacement tubes, and send it back to you.
The tube(s) purchased will also be of the same date code as the clock ordered.