What kind of transistor do I use for switching high voltage with a microcontroller?

Question

I am working on a project with Nixie tubes which require a high voltage supply. I have some "indicator dot" tubes that require 90V DC, and I want to turn them on/off using a microcontroller control line.

I am thinking a transistor is the right tool for this, but I am not familiar enough with the different types to know what will work (BJT vs MOSFET, NPN vs PNP, high-side vs low-side switching).

^{simulate this circuit – Schematic created using CircuitLab}

Please forgive this schematic. It is probably wrong; it is merely indicative of what I want to accomplish.. that is the question I am asking. What is the right way to do this, and what type of transistor should I use? Specific part numbers would also be appreciated.

To be clear, I don't need to amplify any voltages, I already have the voltage supply I need for the 90V line.

Answer 1

NPN is correct transistor type BUT load MUST be in collector.
That way low voltage at Vbe drives the base, and the collector switches HV. The transistor must be rated for usefully more than 90 V.
See www.digikey.com selection guide.
MPSA42 was the olde time favourite at about 300V rating.

With load in the collector the circuit inverts - ie Vin high = on. Whether this suits depends on your need.
This can be altered to Vin high = off with additional components.

^{simulate this circuit – Schematic created using CircuitLab}