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The IV-17 tubes we ship with our null are getting increasingly rare and expensive.

In order to allow us to continue supplying clocks regularily, we've started adding IV-4 tubes to our stock. IV-4 tubes are fully pin compatible with IV-17 tubes and look identical except for the marking on the back.

From now on, we will start shipping the null with either IV-17 or IV-4 tubes depending on what we have in stock.