Thanks; good advice. I am an EE with 12 years of experience and have worked 
with HV before. Built my own tube amp with 420 VDC inside. Would love to 
hear your tips.

What I'm actually building is a volume display for a tube amp. When you 
turn the volume pot, a couple of nixies will display 0-99. The amp in 
question already has a transformer that delivers 220VAC, so I will be 
dropping and rectifying that to get my 180V for the nixie anodes.

On Thursday, May 2, 2019 at 5:01:27 PM UTC-4, gregebert wrote:

> I dont recommend line-operated designs unless you've done some previous 
> design work at  high-ish voltages. There are a lot of not-obvious things 
> that go wrong (line noise, transients, component failure, inadequate 
> isolation) with very bad consequences.
>
> If you have done a lot of past designs, I can share some tips on how to 
> make a line-operated design safer and more reliable. The last thing we want 
> is for someone's nixie clock to cause a fire, or worse.
>
> I've had a few "learning experiences" with line-operated circuits that 
> ended-up with sparks, smoke, and/or small explosions despite careful 
> forethought. There's always something you overlook, and sooner or later it 
> will get you.
>

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